Re: [meteorite-list] Fireball question / sonic boom
Eric...for some reason, the figure of about 9,000 mph sticks in my head as the point of retardation. I don't know where to resource that figure to see if its right or not...but I think its close. geozay George jut brought up a good point and I have a question. The speed of sound is about 760 MPH. What is the speed at which a meteoroid extinguishes and is no longer incandescent? I believe its in the neighborhood of 7,000 mph. If its a small meteoroid, it will extinguish way too high for a sonic boom to reach the ground. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Op 30-3-2011 01:33, geo...@aol.com schreef: I'd be very interested to know if people beyond the heavy end of these falls heard the sonic boom? Does anybody know of a fireball fall and recovery where there were NO sonic booms? GeoZay When you mean that in terms of none reported: the Glanerbrug fall of 1990 in the Netherlands for example. Fireball and smoke trail widely seen, but no sonic booms reported. - Marco __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Hi Sonny all, Everyone has raised some interesting points so far. I remember doing a bit of study on this a number of years ago and one thing I found that stood out was that in all the situations I looked at, when meteorites were found they were ALL within 50km of where a sonic boom was heard. Most less than ~25km. I don't know how true that is and if it works in every case but for the dozen or so I looked at, that was the case. Some may also find my Sounds Associated with Witnessed Meteorite Falls page interesting. This list was put together by Bernd several years ago. Thanks again Bernd! ;-) http://www.meteorites.com.au/oddsends/sounds.html Cheers, Jeff - Original Message - From: wahlpe...@aol.com To: meteorite-list@meteoritecentral.com Sent: Wednesday, March 30, 2011 12:34 AM Subject: [meteorite-list] Fireball question / sonic boom Hi List, It seems like there have been many fireball sightings in the past few months but no material being found on the ground, as in the recent Oklahoma event. I was wondering if the absence of a sonic boom has anything to do with it. Does a sonic boom or explosion have to be present for a major meteorite producing event? Could there still be a few meteorites on the ground with no sonic boom? With Buzzard Coulee, Mifflin, Ash Creek these events all produced meteorites and sonic booms were heard by the locals. Does anyone know if there were sonic booms associated with the Park Forest and Whetstone events? Thanks, Sonny __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Good morning. Sonic booms are formed by shock wave created by the rapid displacement of air. The change in air pressure required to generate the shock wave is only a few pounds per SF. There is a wave generated on the front and at the back of a moving object. The size of the waves are determined by the size, shape and mass of the object. The ability to hear sonic booms are influenced by several factors besides the weight, shape and size of the moving object. Altitude, flight path and weather will influence the ability to actually hear the sonic boom on the ground. Altitude influences the distance the shock wave have to travel before hitting the ground. The wave dissipates with distance. This is probably the single biggest influence on the ability to hear the sonic boom. Wind can affect the shock wave as can the terrain on the earth underneath the flight of an object. Flight path can affect the wave. A straight path will generate a stronger wave than an irregular path. A meteor breaking up will have a more irregular path. The width of the wave for an aircraft is about 1 mile per 1000 feet of altitude. The wave is strongest directly below the object and weakest on the perimeter of the wave. The speed of sound as mentioned is a number that is for sea level. Differences in atmospheric conditions will allow for variances in the speed of sound. -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of geo...@aol.com Sent: Tuesday, March 29, 2011 11:05 PM To: meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] Fireball question / sonic boom Eric...for some reason, the figure of about 9,000 mph sticks in my head as the point of retardation. I don't know where to resource that figure to see if its right or not...but I think its close. geozay George jut brought up a good point and I have a question. The speed of sound is about 760 MPH. What is the speed at which a meteoroid extinguishes and is no longer incandescent? I believe its in the neighborhood of 7,000 mph. If its a small meteoroid, it will extinguish way too high for a sonic boom to reach the ground. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Ablation ceases at 3-4 km/s (about Mach 10), and this is about where the meteoroid becomes invisible. For a typical meteorite, it will rapidly lose this remaining velocity and enter nearly vertical dark flight. Thanks Chris...When math gets beyond my ten fingers and ten toes, I get swamped. :O) Not sure if I've converted it right, but I end up with something like: 3km/s equals 1.76 miles/sec of which that equals about 6336 mph. again... 4km/s equals 2.35 miles/sec of which that equals about 8460 mph. So if I counted on my toes properly, the point of retardation in mph comes to be in the approximate range of 6336mph to 8460 mph? __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Hi Jeff and List Thanks for the link Sounds Associated with Witnessed Meteorite Falls. As a newcomer to chasing fireballs my experience is limited. My only reference is what locals experienced at Buzzard Coulee , Ash Creek and Mifflin. At Buzzard Coulee the locals within the main strewn field explained the event as explosions of large fireworks. One resident was working in his garage said it sounded like someone was rolling bowling balls across his tin roof than a large flash illuminated outside. Ash Creek residents under one of the main breakups reported hearing a large explosion and then seeing a smoke trail followed by two more explosions. At Mifflin I had a chance to talk with numerous residents. Near Mineral Point one person described the sound as a large explosion followed by a popping sound and then a vacuum sound as the meteor passed overhead. At the far end of the strewn field 10 miles East of Mineral Point the sound was described as rumbling sound compared to thunder followed by the same vacuum sound as the meteor passed overhead. The best way they explained the vacuum sound was as if a military jet was passing directly overhead at high speed. Sonny -Original Message- From: Jeff Kuyken i...@meteorites.com.au To: meteorite-list meteorite-list@meteoritecentral.com; wahlperry wahlpe...@aol.com Sent: Tue, Mar 29, 2011 11:02 pm Subject: Re: [meteorite-list] Fireball question / sonic boom Hi Sonny all,Everyone has raised some interesting points so far. I remember doing a bit of study on this a number of years ago and one thing I found that stood out was that in all the situations I looked at, when meteorites were found they were ALL within 50km of where a sonic boom was heard. Most less than ~25km. I don't know how true that is and if it works in every case but for the dozen or so I looked at, that was the case.Some may also find my Sounds Associated with Witnessed Meteorite Falls page interesting. This list was put together by Bernd several years ago. Thanks again Bernd! ;-)http://www.meteorites.com.au/oddsends/sounds.htmlCheers,Jeff- Original Message - From: wahlpe...@aol.comTo: meteorite-list@meteoritecentral.comSent: Wednesday, March 30, 2011 12:34 AMSubject: [meteorite-list] Fireball question / sonic boom Hi List, It seems like there have been many fireball sightings in the past few months but no material being found on the ground, as in the recent Oklahoma event. I was wondering if the absence of a sonic boom has anything to do with it. Does a sonic boom or explosion have to be present for a major meteorite producing event? Could there still be a few meteorites on the ground with no sonic boom? With Buzzard Coulee, Mifflin, Ash Creek these events all produced meteorites and sonic booms were heard by the locals. Does anyone know if there were sonic booms associated with the Park Forest and Whetstone events? Thanks, Sonny __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Fireball question / sonic boom
Hi List, It seems like there have been many fireball sightings in the past few months but no material being found on the ground, as in the recent Oklahoma event. I was wondering if the absence of a sonic boom has anything to do with it. Does a sonic boom or explosion have to be present for a major meteorite producing event? Could there still be a few meteorites on the ground with no sonic boom? With Buzzard Coulee, Mifflin, Ash Creek these events all produced meteorites and sonic booms were heard by the locals. Does anyone know if there were sonic booms associated with the Park Forest and Whetstone events? Thanks, Sonny __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Sonny, A good question. I can't speak to the Wheststone event, but with Park Forest there were sonic booms reported by many in the area. Best, Steve Steve Witt IMCA #9020 http://imca.cc/ --- On Tue, 3/29/11, wahlpe...@aol.com wahlpe...@aol.com wrote: From: wahlpe...@aol.com wahlpe...@aol.com Subject: [meteorite-list] Fireball question / sonic boom To: meteorite-list@meteoritecentral.com Date: Tuesday, March 29, 2011, 8:34 AM Hi List, It seems like there have been many fireball sightings in the past few months but no material being found on the ground, as in the recent Oklahoma event. I was wondering if the absence of a sonic boom has anything to do with it. Does a sonic boom or explosion have to be present for a major meteorite producing event? Could there still be a few meteorites on the ground with no sonic boom? With Buzzard Coulee, Mifflin, Ash Creek these events all produced meteorites and sonic booms were heard by the locals. Does anyone know if there were sonic booms associated with the Park Forest and Whetstone events? Thanks, Sonny __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Fireball question / sonic boom
Hello Sonny, Steve, and List, Steve: with Park Forest there were sonic booms reported by many in the area Meteor blazes path to Park Forest (by Joseph Sjostrom and Nancy Ryan - Tribune staff reporters) - March 27, 2003, 1:20 PM CST: ... Garza said he was in bed when he heard his dog barking and what sounded like *thunder*. We all heard a *sound* about two minutes after. It was like a *sonic boom*. Best wishes from the happy owner of five gorgeous Park Forest meteorites, all of which were kindly given to me by Steve Witt and are, of course, still in my collection where they will stay for good! Steve, thank you once again for these beauties! Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
I'd be very interested to know if people beyond the heavy end of these falls heard the sonic boom? -- Richard Kowalski Full Moon Photography IMCA #1081 --- On Tue, 3/29/11, Bernd V. Pauli bernd.pa...@paulinet.de wrote: From: Bernd V. Pauli bernd.pa...@paulinet.de Subject: [meteorite-list] Fireball question / sonic boom To: meteorite-list@meteoritecentral.com Date: Tuesday, March 29, 2011, 2:03 PM Hello Sonny, Steve, and List, Steve: with Park Forest there were sonic booms reported by many in the area Meteor blazes path to Park Forest (by Joseph Sjostrom and Nancy Ryan - Tribune staff reporters) - March 27, 2003, 1:20 PM CST: ... Garza said he was in bed when he heard his dog barking and what sounded like *thunder*. We all heard a *sound* about two minutes after. It was like a *sonic boom*. Best wishes from the happy owner of five gorgeous Park Forest meteorites, all of which were kindly given to me by Steve Witt and are, of course, still in my collection where they will stay for good! Steve, thank you once again for these beauties! Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Curious... I know there are many variables involved, and it probably varies with the conditions under which each event occurs, but I've read that some people have heard sonic booms (as low boom/rumbles) up to 50 miles away or more. Couldn't one figure out that distance by calculating altitude of any given bolide and air pressure/temp during the time of the event, (since it affects the sound waves at different elevations) to determine how far from the epicenter someone could here the sonic boom? I'm seriously curious about this. Regards, Eric On 3/29/2011 3:30 PM, Richard Kowalski wrote: I'd be very interested to know if people beyond the heavy end of these falls heard the sonic boom? -- Richard Kowalski Full Moon Photography IMCA #1081 --- On Tue, 3/29/11, Bernd V. Paulibernd.pa...@paulinet.de wrote: From: Bernd V. Paulibernd.pa...@paulinet.de Subject: [meteorite-list] Fireball question / sonic boom To: meteorite-list@meteoritecentral.com Date: Tuesday, March 29, 2011, 2:03 PM Hello Sonny, Steve, and List, Steve: with Park Forest there were sonic booms reported by many in the area Meteor blazes path to Park Forest (by Joseph Sjostrom and Nancy Ryan - Tribune staff reporters) - March 27, 2003, 1:20 PM CST: ... Garza said he was in bed when he heard his dog barking and what sounded like *thunder*. We all heard a *sound* about two minutes after. It was like a *sonic boom*. Best wishes from the happy owner of five gorgeous Park Forest meteorites, all of which were kindly given to me by Steve Witt and are, of course, still in my collection where they will stay for good! Steve, thank you once again for these beauties! Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
I'd be very interested to know if people beyond the heavy end of these falls heard the sonic boom? Does anybody know of a fireball fall and recovery where there were NO sonic booms? GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Hi All, Thanks for the replies. It sounds like a sonic boom my be a determining factor in recovering meteorites and which fireballs to chase. Sonny -Original Message- From: Meteorites USA e...@meteoritesusa.com To: meteorite-list meteorite-list@meteoritecentral.com Sent: Tue, Mar 29, 2011 11:41 am Subject: Re: [meteorite-list] Fireball question / sonic boom Curious... I know there are many variables involved, and it probably varies with the conditions under which each event occurs, but I've read that some people have heard sonic booms (as low boom/rumbles) up to 50 miles away or more.Couldn't one figure out that distance by calculating altitude of any given bolide and air pressure/temp during the time of the event, (since it affects the sound waves at different elevations) to determine how far from the epicenter someone could here the sonic boom?I'm seriously curious about this.Regards,EricOn 3/29/2011 3:30 PM, Richard Kowalski wrote: I'd be very interested to know if people beyond the heavy end of these falls heard the sonic boom? -- Richard Kowalski Full Moon Photography IMCA #1081 --- On Tue, 3/29/11, Bernd V. Paulibernd.pa...@paulinet.de wrote: From: Bernd V. Paulibernd.pa...@paulinet.de Subject: [meteorite-list] Fireball question / sonic boom To: meteorite-list@meteoritecentral.com Date: Tuesday, March 29, 2011, 2:03 PM Hello Sonny, Steve, and List, Steve: with Park Forest there were sonic booms reported by many in the area Meteor blazes path to Park Forest (by Joseph Sjostrom and Nancy Ryan - Tribune staff reporters) - March 27, 2003, 1:20 PM CST: ... Garza said he was in bed when he heard his dog barking and what sounded like *thunder*. We all heard a *sound* about two minutes after. It was like a *sonic boom*. Best wishes from the happy owner of five gorgeous Park Forest meteorites, all of which were kindly given to me by Steve Witt and are, of course, still in my collection where they will stay for good! Steve, thank you once again for these beauties! Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.htmlMeteorite-list mailing listMeteorite-list@meteoritecentral.comhttp://six.pairlist.net/mailman/li stinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Thanks for the replies. It sounds like a sonic boom my be a determining factor in recovering meteorites and which fireballs to chase. Yep...that's what I've been saying for yearsIf no booms...save yourself the wear and tear. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
All, There are several falls where no sonic boom was noticed. Speaking of US falls, the last two that come to mind are Berthoud, CO and New Orleans, LA. Others that I can readily recall are Salem, OR and Athens, AL. Reports from the latter two specifically state there were no explosions or booms. Cheers, Frank From: geo...@aol.com geo...@aol.com To: meteorite-list@meteoritecentral.com; meteor...@meteorobs.org Sent: Tue, March 29, 2011 4:33:05 PM Subject: Re: [meteorite-list] Fireball question / sonic boom I'd be very interested to know if people beyond the heavy end of these falls heard the sonic boom? Does anybody know of a fireball fall and recovery where there were NO sonic booms? GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
There are several falls where no sonic boom was noticed. Speaking of US falls, the last two that come to mind are Berthoud, CO and New Orleans, LA. Others that I can readily recall are Salem, OR and Athens, AL. Reports from the latter two specifically state there were no explosions or booms Thanks Frank...never knew there were any sizable meteorites recovered from falls without any sonic booms reported. I bet there were some for those above, but there probably weren't people in the right places to hear it. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
From: geo...@aol.com geo...@aol.com Subject: Re: [meteorite-list] Fireball question / sonic boom Thanks Frank...never knew there were any sizable meteorites recovered from falls without any sonic booms reported. I bet there were some for those above, but there probably weren't people in the right places to hear it. GeoZay ** So, Like the old question goes: If a meteorite falls and makes a sonic boom, but nobody is there to hear it, does it still make a sound? ;-) Best wishes, Robert Woolard __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
or ... if a meteor produces a sonic boom, but nobody is there to hear it, does it still drop meteorites? ;^) gary On Mar 29, 2011, at 3:53 PM, Robert Woolard wrote: From: geo...@aol.com geo...@aol.com Subject: Re: [meteorite-list] Fireball question / sonic boom Thanks Frank...never knew there were any sizable meteorites recovered from falls without any sonic booms reported. I bet there were some for those above, but there probably weren't people in the right places to hear it. GeoZay ** So, Like the old question goes: If a meteorite falls and makes a sonic boom, but nobody is there to hear it, does it still make a sound? ;-) Best wishes, Robert Woolard __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list Gary Fujihara Big Kahuna Meteorites (IMCA#1693) 105 Puhili Place, Hilo, Hawai'i 96720 http://bigkahuna-meteorites.com/ http://shop.ebay.com/fujmon/m.html (808) 640-9161 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Yep..the Geico man proved it!! Stuart McDaniel Lawndale, NC Secr., Cleve. Co. Astronomical Society Member - KCA, KBCA, CDUSA -Original Message- From: Robert Woolard Sent: Tuesday, March 29, 2011 9:53 PM To: meteorite-list@meteoritecentral.com ; geo...@aol.com ; fcre...@prodigy.net Subject: Re: [meteorite-list] Fireball question / sonic boom From: geo...@aol.com geo...@aol.com Subject: Re: [meteorite-list] Fireball question / sonic boom Thanks Frank...never knew there were any sizable meteorites recovered from falls without any sonic booms reported. I bet there were some for those above, but there probably weren't people in the right places to hear it. GeoZay ** So, Like the old question goes: If a meteorite falls and makes a sonic boom, but nobody is there to hear it, does it still make a sound? ;-) Best wishes, Robert Woolard __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Something to consider... If all events with sonic booms generate meteorites, then there are meteorites on the ground in Louisiana/Mississippi from the big fireball there a couple of months back. Here's Jake Schaefer's page on that event again... http://3dradar.wordpress.com/2011/01/14/southern-ms-fall-1122011-at-0250-utc/ Cheers, Marc Fries On Mar 29, 2011, at 5:11 PM, geo...@aol.com wrote: There are several falls where no sonic boom was noticed. Speaking of US falls, the last two that come to mind are Berthoud, CO and New Orleans, LA. Others that I can readily recall are Salem, OR and Athens, AL. Reports from the latter two specifically state there were no explosions or booms Thanks Frank...never knew there were any sizable meteorites recovered from falls without any sonic booms reported. I bet there were some for those above, but there probably weren't people in the right places to hear it. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
I think most large fireballs do not produce meteorites. Most meteorites are the product of rather ordinary meteors, which survive because they are slow and shallow and slow down while still very high, don't fragment, and produce single individuals. Of course, the vast majority of these are never found, and those that are have no associated fireball. When there are big fireballs- the sort that get meteorite hunters salivating- the situation is different. Most big fireballs probably don't produce meteorites. Those that do, however, do so because they start off with enough mass that they can afford to lose 95% of it and still have something get low enough to hit dense air at a low enough speed to avoid complete destruction. That height is below about 30 km, which happens to be about the height where sonic booms can be produced and reach the ground. So the presence of a sonic boom with a fireball is a useful indicator that meteorites might be produced. The absence of one, however, probably shouldn't be taken as an indicator that they were not, since a meteor can still end (without complete ablation) high enough that no sonic boom will reach the ground. Chris * Chris L Peterson Cloudbait Observatory http://www.cloudbait.com - Original Message - From: wahlpe...@aol.com To: meteorite-list@meteoritecentral.com Sent: Tuesday, March 29, 2011 7:34 AM Subject: [meteorite-list] Fireball question / sonic boom Hi List, It seems like there have been many fireball sightings in the past few months but no material being found on the ground, as in the recent Oklahoma event. I was wondering if the absence of a sonic boom has anything to do with it. Does a sonic boom or explosion have to be present for a major meteorite producing event? Could there still be a few meteorites on the ground with no sonic boom? With Buzzard Coulee, Mifflin, Ash Creek these events all produced meteorites and sonic booms were heard by the locals. Does anyone know if there were sonic booms associated with the Park Forest and Whetstone events? Thanks, Sonny __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
The absence of one, however, probably shouldn't be taken as an indicator that they were not, since a meteor can still end (without complete ablation) high enough that no sonic boom will reach the ground. Wouldn't these(meteorites) that are high enuf that no sonic boom will reach the ground end up being rather small meteorites? This because a small meteorite will be slowed down rather quickly higher up. The larger meteorites having more momentum to carry it on down to the lower atmosphere will still have a velocity fast enuf to produce the big thunder like sonics? GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
George jut brought up a good point and I have a question. The speed of sound is about 760 MPH. What is the speed at which a meteoroid extinguishes and is no longer incandescent? Regards, Eric On 3/29/2011 10:12 PM, geo...@aol.com wrote: The absence of one, however, probably shouldn't be taken as an indicator that they were not, since a meteor can still end (without complete ablation) high enough that no sonic boom will reach the ground. Wouldn't these(meteorites) that are high enuf that no sonic boom will reach the ground end up being rather small meteorites? This because a small meteorite will be slowed down rather quickly higher up. The larger meteorites having more momentum to carry it on down to the lower atmosphere will still have a velocity fast enuf to produce the big thunder like sonics? GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
The vast majority of meteorites retard while they are still far too high for sonic booms to reach the ground. The big, impressive fireballs that are more massive and reach lower heights are the exceptions. The meteoroids that slow down while still high are more likely to produce single meteorites; those that have enough mass to reach low altitudes still traveling at high speed tend to fragment and produce strewn fields. Chris * Chris L Peterson Cloudbait Observatory http://www.cloudbait.com - Original Message - From: geo...@aol.com To: meteorite-list@meteoritecentral.com Sent: Tuesday, March 29, 2011 11:12 PM Subject: Re: [meteorite-list] Fireball question / sonic boom The absence of one, however, probably shouldn't be taken as an indicator that they were not, since a meteor can still end (without complete ablation) high enough that no sonic boom will reach the ground. Wouldn't these(meteorites) that are high enuf that no sonic boom will reach the ground end up being rather small meteorites? This because a small meteorite will be slowed down rather quickly higher up. The larger meteorites having more momentum to carry it on down to the lower atmosphere will still have a velocity fast enuf to produce the big thunder like sonics? GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
Ablation ceases at 3-4 km/s (about Mach 10), and this is about where the meteoroid becomes invisible. For a typical meteorite, it will rapidly lose this remaining velocity and enter nearly vertical dark flight. Chris * Chris L Peterson Cloudbait Observatory http://www.cloudbait.com - Original Message - From: Meteorites USA e...@meteoritesusa.com To: meteorite-list@meteoritecentral.com Sent: Tuesday, March 29, 2011 11:27 PM Subject: Re: [meteorite-list] Fireball question / sonic boom George jut brought up a good point and I have a question. The speed of sound is about 760 MPH. What is the speed at which a meteoroid extinguishes and is no longer incandescent? Regards, Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fireball question / sonic boom
George jut brought up a good point and I have a question. The speed of sound is about 760 MPH. What is the speed at which a meteoroid extinguishes and is no longer incandescent? I believe its in the neighborhood of 7,000 mph. If its a small meteoroid, it will extinguish way too high for a sonic boom to reach the ground. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
