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<P><FONT face=Verdana><STRONG><FONT color=#000000><FONT
color=#ff0000> </FONT></FONT><FONT color=#000000>Grupo ARARA - Astronomia,
Rádio-Astronomia e Rádio-Amadorismo</FONT></STRONG></FONT><FONT
face=Verdana><FONT color=#000000><STRONG> </STRONG><STRONG><A
href="http://www.arara.estgl.ipv.pt">http://www.arara.estgl.ipv.pt</A>
</STRONG><STRONG> </STRONG></FONT></FONT></FONT></FONT><FONT
size=3><STRONG>(A p</STRONG>ágina desenvolveu-se a partir do convívio informal
entre professores e alunos do curso de Engenharia Informática e Telecomunicações
da Escola Superior de Tecnologia e Gestão de Lamego (ESTGL), nos corredores que
dão acesso às salas de trabalho, onde amistosa e cordialmente se discutia acerca
da importância vital que a tecnologia tem, cada vez mais, para o mundo/sociedade
actual. Foi, então, neste contexto que nasceu este grupo de trabalho, que
tem por objectivo fomentar a ideia de que a ciência se pode aprender de
forma agradável, fácil e simples, associando o lazer ao labor e permitindo ainda
a facilidade de acesso e consulta de informação e/ou iniciativas variadas, por
parte dos elementos que constituem esta equipa, a todos os interessados
em <STRONG>Astronomia, Rádio Astronomia e
Rádio-Amadorismo</STRONG>.)</FONT></P>
<P><FONT size=3><STRONG><FONT color=#ff0000>RADIO STORMS ON JUPITER:<FONT
face=Verdana> </FONT></FONT></STRONG></FONT><FONT face=Verdana>On April 11th,
the loudspeaker of Thomas Ashcraft's 21 MHz radio telescope in New Mexico
suddenly began to hiss and crackle. The sounds grew louder as Jupiter rose in
the blue morning sky. "I am pleased to report," says Ashcraft, "a </FONT><A
href="http://www.heliotown.com/Jupiter_IoB20090411_1522UT.html"><FONT
face=Verdana>successful</FONT></A><FONT face=Verdana> </FONT><A
href="http://www.heliotown.com/Jupiter_IoB_20090411_1514U.html"><FONT
face=Verdana>recording</FONT></A><FONT face=Verdana> of Jovian S-bursts--the
first of 2009." Click on the image to listen:</FONT></P>
<P align=center><A
href="http://www.heliotown.com/Jiob20090411_1514utAshcraft.mp3"><FONT
face=Verdana><IMG height=318
src="http://www.spaceweather.com/swpod2009/13apr09/j20090411iob1514_strip.jpg"
width=360 border=1></FONT></A></P>
<P><FONT face=Verdana>The staccato pops sound like lightning in the loudspeaker
of a car radio, but lightning did not make these sounds. </FONT><A
href="http://ufro.astro.ufl.edu/decframe.htm"><FONT
face=Verdana>S-bursts</FONT></A><FONT face=Verdana> are caused by natural radio
lasers in Jupiter's magnetosphere that sweep past Earth as Jupiter rotates.
Electrical currents flowing between Jupiter's upper atmosphere and the volcanic
moon Io can boost these emissions to power levels </FONT><A
href="http://radiojove.gsfc.nasa.gov/"><FONT face=Verdana>easily
detected</FONT></A><FONT face=Verdana> by ham radio antennas on Earth. Jovian
S-bursts and L-bursts can mimic the sounds of woodpeckers, whales, and waves
crashing on the beach. Here are a few <STRONG>audio samples:</STRONG> </FONT><A
href="http://science.nasa.gov/headlines/images/radiojove/sburst.mp3"><FONT
face=Verdana>S-bursts</FONT></A><FONT face=Verdana>, </FONT><A
href="http://science.nasa.gov/headlines/images/radiojove/SBURSTSL.WAV"><FONT
face=Verdana>S-bursts</FONT></A><FONT face=Verdana> (slowed down 128:1),
</FONT><A
href="http://science.nasa.gov/headlines/images/radiojove/lburst.mp3"><FONT
face=Verdana>L-Bursts</FONT></A></P>
<P><FONT face=Verdana>"I recorded the storm in broad daylight," notes Ashcraft.
"One of the advantages of this long solar minimum is that the daytime ionosphere
is quieter and more transparent to decametric radio waves. There will definitely
be </FONT><A href="http://www.astro.ufl.edu/juptables.html"><FONT
face=Verdana>more</FONT></A><FONT face=Verdana> good Jupiter storms in the
months to come." Stay tuned!</FONT></P>
<P><FONT face=Verdana>Fonte: </FONT><FONT face="Times New Roman"><STRONG>Radio
JOVE Project</STRONG> ( Radio JOVE students and amateur scientists observe
and analyze natural radio emissions of Jupiter, the Sun, and our galaxy.) <A
href="http://radiojove.gsfc.nasa.gov/">http://radiojove.gsfc.nasa.gov/</A></FONT></P>
<P><FONT face=Verdana></FONT> </P>
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