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Re: [DX] Vs: Re: stratwarm
160 metrillä Alaska-Eurooppa kuulemma auki parhaillaan.
Risto
jonedx@xxxxxxxx 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
>>
>>
>>
>>>>>mauno.ritola@xxxxxxxxx 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 <mauno.ritola@xxxxxxxxx> 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
>>
>> >>> 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
>>
>>
>>
>>
>>
>>
>>
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>___________________________________________________________________________________
>
>
>> Ennakkotilaa WRTH 2006 nyt:
>> http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/
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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:
>>http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/
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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
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>published by Michael Stutz at http://dsl.org/copyleft/dsl.txt
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Ennakkotilaa WRTH 2006 nyt:
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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