ARLA/CLUSTER: Seja um Radioastrônomo Amador utilizando a sua estação.

[João Gonçalves Costa]

RADIO-ACTIVE SUNSPOT:

Sunday in new Mexico, a startling roar issued from the loudspeaker of amateur astronomer Thomas Ashcraft<mailto:ashcraft  heliotown.com>'s radio telescope. "It was sunspot 1057," he says. "All day long it had been producing small radio bursts around 21 MHz. Then, at 1813 UT, it let loose a big one. The burst only lasted a minute, but it saturated the radios." Click here to listen<http://www.heliotown.com/201003281813ut2123Ashcraft.mp3>.

[http://spaceweather.com/swpod2010/29mar10/Rogerio-Marcon1_strip.jpg]<http://www.spaceweather.com/submissions/large_image_popup.php?image_name=Rogerio-Marcon-2010-03-28_10-24-20_highResolution_SW_1269817667.jpg>
Photo credit: Rogerio Marcon of Campinas, Brazil [details<http://www.spaceweather.com/submissions/large_image_popup.php?image_name=Rogerio-Marcon-2010-03-28_10-24-20_highResolution_SW_1269817667.jpg>]

The sounds you just heard were a mix of Type III<http://www-pw.physics.uiowa.edu/space-audio/typeIII.html> and Type V<http://adsabs.harvard.edu/full/1967ApJ...150.1081W> radio emissions. They're caused by beams of electrons shooting out of the sunspot into the sun's atmosphere overhead. Not all sunspots produce radio emissions, but AR1057 is definitely "radio-active." "I'll be listening for more bursts in the days ahead," says Ashcraft.

You can, too, using your own radio telescope. NASA's Radio JOVE<http://radiojove.gsfc.nasa.gov/> program will sell you a kit and teach you how to become an amateur radio astronomer all for less than $200.

more images: from Eric Roel<http://www.spaceweather.com/submissions/large_image_popup.php?image_name=Eric-Roel.-AR-1057-del-27-y-28-de-marzo-del-2010-an_1269820890.jpg> of Valle de Bravo, Mexico; from Phillip Jones<http://www.spaceweather.com/submissions/large_image_popup.php?image_name=Phillip-Jones-Sunspot-1057_800px_1269816227.jpg> of Frisco, Texas; from John Minnerath<http://www.spaceweather.com/submissions/large_image_popup.php?image_name=John-Minnerath-Mar-28-2_1269808853.jpg> of Crowheart Wyoming; from Francisco A. Rodriguez<http://www.spaceweather.com/submissions/large_image_popup.php?image_name=Francisco-A.-Rodriguez-4472136727_9a4cf977f1_o_1269857791.jpg> of Cabreja Mountain Observatory, Canary Islands;
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