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Re: Re: Re: [DX] Keleistä ja R Juventud Don Bosco
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" <Tarmo.Kontro@xxxxxxxx>
> To: <dx@xxxxxxxxxxxxx>
> 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
>
> >>> mauno.ritola@xxxxxxxxx 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" <ari.kilponen@xxxxxxxxxx>
> To: <dx@xxxxxxxxxxxxx>
> 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
>
>
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> 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
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> Ennakkotilaa WRTH 2006 nyt:
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> _______________________________________________
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> 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
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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