160 metrillä Alaska-Eurooppa kuulemma auki parhaillaan. Risto
[EMAIL PROTECTED] wrote: >blokkaa joo, mutta paremmin putki auki pohjois-amerikkaan tänään - 1270 >ESPN-asema tulee just. Mites ARK pohjoisessa? > >73s > >JNU > > > >>Moi >>Mielestäni tuo Anomalia ei ole Thomas Giellan keksintöä, se liittyy >> >> >ionosfääriin. Mitä > > >>tulee StartWarmin yhteyteen siihen, teidäpä sitä. >>Mutta joku tässä blokkaa keliä >> >>73 tk >> >>Tarmo Kontro >>Kymenlaakso Polytechnic >>PL 13 >>FIN-48231 Kotka >>+358 44 7028 342 >>fax +358 5 2208209 >> >> >> >>>>>[EMAIL PROTECTED] 12/08/05 12:16 >>> >>>>> >>>>> >>Kiitos tiedosta. Eipä se sitten sitä ole. Mutta tuntuu tosiaan, että >> >> >vaimennus on voimakasta nimenomaan Pohjois-Amerikan suuntaan, Aasiasta >sentään tulee asemaa ihan kohtalaisesti. Lähialueen asemat ovat >voimakkaita: Islanti 189, Norja 675 ja britit tulevat poikkeuksellisen >hyvin. Planetary K on ollut nyt seitsemän kertaa peräkkäin nolla ja >ykköstä huonompi viimeksi perjantaina ... > > >>73, MR >> >> ----- Original Message ----- >> From: esko nykanen >> To: Suomalaisten DX-lista >> Sent: Wednesday, December 07, 2005 11:46 PM >> Subject: [DX] stratwarm >> >> >>Pitääpä kysäistä noiden stratwarmien ennusteista työkavereiltani,kun >> >> >palailen vapailta.Ei ole tullut vuosiin itse > > >> seurattua. >>Tällä hetkellä ei ole mitään stratwarmia NA-Eurooppa >> >> >välillä.Paremminkin kovia pakkasia tuolla > > >> yli 30 km korkeudella (10 mb). >>Tuossa linkki,josta löytyy maailman radioluotaukset ym.Sodankylän >> >> >asema on EFSO,Jokioinen 02963. > > >> http://weather.uwyo.edu/upperair/sounding.html >> sieltä mm Arctic kartta....jne >> >> >> >http://weather.uwyo.edu/cgi-bin/uamap?REGION=np&OUTPUT=gif&TYPE=obs&LEVEL=10&TIME=2005120712 > > >> terv EN >> >> Mauno Ritola <[EMAIL PROTECTED]> wrote: >>Thomas Giellan jut! tuihin on syytä suhtautua varauksella; hän mm. >> >> >kuuluu > > >>siihen laajahkoon amerikkalaiseen koulukuntaan, jonka mukaan ilmiötä >> >> >nimeltä > > >> globaali lämpiäminen ei ole olemassakaan. Samoin olen nähnyt häneltä >> joitakin varsin erikoisia keskiaaltojen etenemistä koskevia näkemyksiä. >> Mutta olisipa kiva tietää, onko stratwarm alertin edellytykset olemassa >> tällä hetkellä! >> >> 73, MR >> >> ----- Original Message ----- >> From: "Tarmo Kontro" >> To: >> Sent: Wednesday, December 07, 2005 6:06 PM >> Subject: Vs: Re: [DX] Keleistä ja R Juventud Don Bosco >> >> >> Moro >>Tiedemiehet voisivat kommentoida tuota "anomaliaa". Siitähän oli >> >> >puhetta jo > > >>1970-luvulla. Paradoksaalista on, että häiriöitä on eniten juuri >> >> >syksyn ja > > >>kevään tasauspäivien lähellä, mutta myös hyviä kelejä. Tämä liittynee >> >> >tuohon > > >>D-kerroksen "anomaaliseen" absorptioon. Toisena tekijänä voisi olla >> >> >myös > > >>elektronien "aktiivisuus" (en ole katsonut tarkasti, ! mutta olivat >> >> >hiljakkoin > > >>korkealla) - vai liittyvätkö nämä yhteen? Tarvitaanko vähän enemmän >> >> >auringon > > >> valoa täällä pohjan perillä, jotta "ionosfääri toimisi paremmin". >>Stratwarm-hälytyksiä ei valitettavasti enää anneta, mikäli ymmärrän >> >> >oikein. > > >> Ja edelleen häilyy vielä tuo epäilys kelien, saastumisen ja >> ilmastonlämpenemisen yhteydestä toisiinsa ... >> >> Pari jutttua kn4lf:n sivuilta >> >> "D Region Mid Winter Absorption Anomaly- >> >>A period of increased MF radio wave absorption at high and mid >> >> >latitudes > > >>occurring in mid winter and is associated with sudden stratospheric >> >> >warming > > >>and the Quasi Biennial Oscillation (QBO). If you look in your radio >> >> >logs for > > >>160 meters you will notice that most of your good DX contacts are in >> >> >the > > >>fall and spring. This is due to the D Region Mid Winter Absorption >> >> >Anomaly. > > >> (See definition #17. Sporadic-D (Ds) Absorption & Wave Guiding). (See >> definition #19. Sudden Stratospheric Warming (STRATWARM ALERT). >> " >> " >> >>Sudden stratospheric warming is a major temperature change of the >> >> >winter > > >>time polar and middle atmosphere from the Tropopause (where the >> >> >troposphere > > >>transitions into the stratosphere) to the base (D-layer) of the >> >> >ionosphere, > > >> lasting for many days at a time and characterized by a warming of the >>stratospheric temperature by some tens of degrees (temperature >> >> >inversion), > > >> in unison with adjacent tropospheric cooling. >> " >>Another way to explain stratospheric warming is a major disturbance of >> >> >the > > >>winter polar middle atmosphere from the Tropopause to D-region which >> >> >is at > > >>the base of the Mesosphere resulting from a breakdown of the polar >> >> >vortex > > >>into two circulation cells. Air trapped in the vortexes is mixed by >> >> >the new > > >>meridional flow and is exposed to sunlight. Solar lyman alpha ionizes >> >> >the > > >> nitric oxide gasses resulting in an increase in electron density and >> producing strong MF absorption. >> A little related Troposphere Meteorology: >> >> Interrelated with the splitting and shifting of the Arctic Circumpolar >>Vortex, is a Troposphere level negative North Atlantic Oscillation >> >> >(NAO) and > > >> Pacific-North America Anomaly (PNA), mid and upper air height anomaly >> pattern. This equates to a large high pressure ridge in Western North >>America extending northward all the way into the Yukon region of >> >> >Canada and > > >>a deep trough in the Eastern North America, from the eastern U.S. >> >> >extending > > >>down into the Yucatan region of Mexico, with a second ridge in the >> >> >western > > >>North Atlantic Ocean. This pattern is also called a dual blocking >> >> >ridge and > > >>taps Siberian Arctic air, sending it across the North Pole into the >> >> >eastern > > >>2/3's of Canada and the U.S. providing for very cold surface >> >> >temperatures. > > >>As the stratosphere lies below the ionosphere, which is at mesosphere >> >> >and > > >> thermosphere height, you would not expect to see stratospheric warming >>effect medium freq! uency propagation in any way BUT medium frequency >> >> >signals > > >>do propagate off of temperature inversions and moisture >> >> >discontinuities and > > >> a temperature inversion is involved with stratospheric warming. So it's >>probable that a medium frequency signal could do any number of things >> >> >when > > >> scattering off of a temperature inversion, at any height. Unfortunately >>though some otherwise very knowledgeable Physicists stubbornly resist >> >> >this > > >> concept. >> >>You can almost always correlate the coldest weather occurrences with >> >> >poor > > >> medium frequency propagation conditions. >> >> Also Stratospheric Warming (STRATWARM) has a negative effect on medium >> frequency propagation, due to increasing medium frequency radio wave >>absorption by the D layer, via upward propagating Internal >> >> >Buoyancy/Gravity > > >> Waves (IBGW's). >> >> This phenomenon also occurs in southern hemisphere winter but is less >> pronounced. >> " >> >> 73 tk >> >> >> Tarmo Kontro >> Kymenlaakso Polytechnic >> PL 13 >> FIN-48231 Kotka >> +358 44 7028 342 >> fax +358 5 2208209 >> >> >>> [EMAIL PROTECTED] 12/07/05 11:15 >>> >> Sama Itä-Suomessa, ei kuulunut mitään Atlantin takaa. >> >> Onko se midwinter anomaly jokin täysin näiden tavallisten indeksien >> ulkopuolinen ilmiö? >> >> 73, MR >> >> >> >> >> >> >> >------------------------------------------------------------------------------ > > >>To help you stay safe and secure online, we've developed the all new >> >> >Yahoo! Security Centre. > > >> >> >> >------------------------------------------------------------------------------ > > >> >> >> >___________________________________________________________________________________ > > >> Ennakkotilaa WRTH 2006 nyt: >> http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/ >> ----------------------------------------------------------------- >> DX mailing list >> [email protected] >> http://arizona.hard-core-dx.com/mailman/listinfo/dx >> _______________________________________________ >> >> THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed >>and/or modified under the conditions set down in the Design Science >> >> >License > > >> published by Michael Stutz at http://dsl.org/copyleft/dsl.txt >> >> >> >> >___________________________________________________________________________________ > > >>Ennakkotilaa WRTH 2006 nyt: >>http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/ >>----------------------------------------------------------------- >>DX mailing list >>[email protected] >>http://arizona.hard-core-dx.com/mailman/listinfo/dx >>_______________________________________________ >> >>THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed >>and/or modified under the conditions set down in the Design Science License >>published by Michael Stutz at http://dsl.org/copyleft/dsl.txt >> >> > > >___________________________________________________________________________________ >Ennakkotilaa WRTH 2006 nyt: >http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/ >----------------------------------------------------------------- >DX mailing list >[email protected] >http://arizona.hard-core-dx.com/mailman/listinfo/dx >_______________________________________________ > >THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed >and/or modified under the conditions set down in the Design Science License >published by Michael Stutz at http://dsl.org/copyleft/dsl.txt > > ___________________________________________________________________________________ Ennakkotilaa WRTH 2006 nyt: http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/ ----------------------------------------------------------------- DX mailing list [email protected] http://arizona.hard-core-dx.com/mailman/listinfo/dx _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://dsl.org/copyleft/dsl.txt
