jepjep, saas nähdä mitä yö ja aamu tuo tullessaan, aurora ykköstä ja kakkosta, A-indeksi nollassa.... tosin niin taisi olla eilenkin.... KNR 650 tulee nyt kuitenkin (20.10UT) kivasti.....
kelejä, ja joululahjoja. JNU > Thomas Giellan juttuihin 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" <[EMAIL PROTECTED]> > To: <[email protected]> > 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 frequency 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 > > ----- Original Message ----- > From: "Ari Kilponen" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, December 07, 2005 10:51 AM > Subject: [DX] Keleistä ja R Juventud Don Bosco > > > Moi kaikki, > > no jopas jotakin taas, kaikki ennusteet vihreällä, mutta ei vain kuulu > yhtään > mitään lännestä. Siis > tänään keskiviikkoaamuna. Yöllä en kuunnellut. Mitenkäs Etelä-Suomessa? > > Apropos R Juventud Don Bosco 1640, Dominikaaninen tasavalta: onko kukaan > raportoinut englanniksi ja saanut vastausta? Meikäläisen espanjan taito kun > on > heikon ja säälittävän rajamailla... Vai > pitääkö alkaa vääntämään raporttia espanjaksi? Toimiiko aseman e-mailosoite? > > 73's, > ARK > > ___________________________________________________________________________________ > 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 ___________________________________________________________________________________ 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
