ARLA/CLUSTER: NVIS abertura hoje nos 40 mts

[João Gonçalves Costa]

Caros colegas,

Segundo os mais recentes ionogramas da Digisonde 256 EL ARENOSILLO em Huelva e tal como se previa devido à intensa actividade Solar registada nos últimos dias,  hoje temos finalmente, boas aberturas nos 40m em NVIS.

A propagação NVIS - Near Vertical Incident Skywave acenta basicamente na capacidade que a ionosfera, F0F2 - frequência critica da camada F2, têm de reflectir e na forma de um cone invertido com um diâmetro de aproximadamente 500 Km um sinal que lhe chegue num ângulo de incidência entre 60º e 90º, ideal para os QSO`s nacionais.

[http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040131505_IO_tn.PNG] <http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Column=4&Row=4&Width=240&ImageOrder=descending&Page=1&SelectedPic=/IonoGIF.secure/EA036_2010040131505_IO.PNG>
09 Feb 2010 13:15 UT (14:15 LT)
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09 Feb 2010 13:00 UT (14:00 LT)
[http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040124505_IO_tn.PNG] <http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Column=4&Row=4&Width=240&ImageOrder=descending&Page=1&SelectedPic=/IonoGIF.secure/EA036_2010040124505_IO.PNG>
09 Feb 2010 12:45 UT (13:45 LT)
[http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040123005_IO_tn.PNG] <http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Column=4&Row=4&Width=240&ImageOrder=descending&Page=1&SelectedPic=/IonoGIF.secure/EA036_2010040123005_IO.PNG>
09 Feb 2010 12:30 UT (13:30 LT)


RADIO-ACTIVE SUNSPOT: Behemoth sunspot 1045 is crackling with M-class<http://spaceweather.com/glossary/flareclasses.html?PHPSESSID=s2koqrh3ih00bvkhfvvav1dib7> solar flares--and that's not all. "There have been many loud shortwave radio bursts over the past two days," reports amateur radio astronomer Thomas Ashcraft of New Mexico. "Some of the bursts have completely saturated my receivers." Just listen<http://www.heliotown.com/Sun_20100207_Ashcraft.html> to the sounds coming from the loudspeakers in his observatory.The roaring sounds you just heard were mainly Type III<http://www-pw.physics.uiowa.edu/space-audio/typeIII.html> radio bursts, caused by beams of electrons streaming through the sun's outer atmosphere. Sunspot 1045 appears poised to explosively accelerate more electrons in the days ahead as the flare-show continues. Ham radio operators, point your Yagis<http://spaceweather.com/submissions/large_image_popup.php?image_name=John-Ferrington-Sun-Halo_1241330709.jpg> toward the sun!

[http://spaceweather.com/images2010/09feb10/midi163.gif]<http://spaceweather.com/images2010/09feb10/midi512_blank.gif?PHPSESSID=s2koqrh3ih00bvkhfvvav1dib7>

Daily Sun: 09 Feb. 10

Fonte: Ionogram History Page Digisonde 256 EL ARENOSILLO ( http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Mode=U&Column=8+rows&Row=4+columns&Imageorder=descending ) e http://spaceweather.com<http://spaceweather.com/>
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