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<P><FONT face=Tahoma>Caros colegas,<BR><BR>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.</FONT></P>
<P><FONT face=Arial>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.</FONT></P>
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<ADDRESS><A
href="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"><IMG
alt=/IonoGIF.secure/EA036_2010040131505_IO.PNG
src="http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040131505_IO_tn.PNG">
</A></ADDRESS><FONT size=-2><STRONG>09 Feb 2010 13:15 UT (14:15
LT)</STRONG></FONT> </CENTER>
<TD>
<CENTER>
<ADDRESS><A
href="http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Column=4&Row=4&Width=240&ImageOrder=descending&Page=1&SelectedPic=/IonoGIF.secure/EA036_2010040130005_IO.PNG"><IMG
alt=/IonoGIF.secure/EA036_2010040130005_IO.PNG
src="http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040130005_IO_tn.PNG">
</A></ADDRESS><FONT size=-2><STRONG>09 Feb 2010 13:00 UT (14:00
LT)</STRONG></FONT> </CENTER>
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<TD>
<CENTER>
<ADDRESS><A
href="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"><IMG
alt=/IonoGIF.secure/EA036_2010040124505_IO.PNG
src="http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040124505_IO_tn.PNG">
</A></ADDRESS><FONT size=-2><STRONG>09 Feb 2010 12:45 UT (13:45
LT)</STRONG></FONT> </CENTER>
<TD>
<CENTER>
<ADDRESS><A
href="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"><IMG
alt=/IonoGIF.secure/EA036_2010040123005_IO.PNG
src="http://iono.inta.es/IonoGIF.secure/tn/EA036_2010040123005_IO_tn.PNG">
</A></ADDRESS><FONT size=-2><STRONG>09 Feb 2010 12:30 UT (13:30
LT)</STRONG></FONT> </CENTER></TD></TR></TBODY></TABLE><SPAN
class=dailySunTitleText><FONT face=Verdana></FONT></SPAN></P>
<DIV><SPAN class=dailySunTitleText></SPAN><SPAN class=dailySunTitleText><FONT
color=#ff0000 size=3><STRONG>RADIO-ACTIVE SUNSPOT: </STRONG></FONT>Behemoth
sunspot 1045 is crackling with <A
href="http://spaceweather.com/glossary/flareclasses.html?PHPSESSID=s2koqrh3ih00bvkhfvvav1dib7">M-class</A>
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." <A
href="http://www.heliotown.com/Sun_20100207_Ashcraft.html">Just listen</A> to
the sounds coming from the loudspeakers in his observatory.The roaring sounds
you just heard were mainly <A
href="http://www-pw.physics.uiowa.edu/space-audio/typeIII.html">Type III</A>
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
<A
href="http://spaceweather.com/submissions/large_image_popup.php?image_name=John-Ferrington-Sun-Halo_1241330709.jpg">Yagis</A>
toward the sun!</DIV>
<DIV>
<P><A
href="http://spaceweather.com/images2010/09feb10/midi512_blank.gif?PHPSESSID=s2koqrh3ih00bvkhfvvav1dib7"><IMG
height=163 src="http://spaceweather.com/images2010/09feb10/midi163.gif"
width=163 border=0></A><SPAN class=dailySunTitleText></SPAN></P>
<P><SPAN class=dailySunTitleText>Daily Sun: 09 Feb. 10</SPAN></P>
<P></SPAN><FONT color=#0000ff><FONT face=Tahoma>Fonte: <FONT
color=#000000>Ionogram History Page Digisonde 256 EL
ARENOSILLO </FONT></FONT></FONT><FONT face=Tahoma color=#0000ff><FONT
face="Times New Roman" color=#000000><FONT face=Tahoma>( </FONT><A
href="http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Mode=U&Column=8+rows&Row=4+columns&Imageorder=descending"><FONT
face=Tahoma>http://iono.inta.es/cgi-bin/UniSearch.exe?Data=1&Mode=U&Column=8+rows&Row=4+columns&Imageorder=descending</FONT></A><FONT
face=Tahoma><STRONG> </STRONG>) e </FONT><A href="http://spaceweather.com/"
target=_blank><FONT face=Tahoma>http://spaceweather.com</FONT></A><FONT
face="Times New Roman"> </FONT></FONT></FONT></P></DIV></BODY></HTML>