Hercules A

Hercules A
Radio-Optical View of the Galaxy Hercules A - Many thanks to: NASA, ESA, S. Baum and C. O'Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA)

Monday, May 10, 2010

Strong type III radio burst and flare May 8 2010

The WAVES radio telescope of the STEREO Ahead Observatory, located about 1 Astronomical Unit ahead of the Earth, recorded a strong type III radio burst near 2010 UT. It was in a good position to record this event, which was probably generated by active region 11069, near the Solar west limb.

STEREO Behind also observed it, with weaker intensity.
Type III radiation is directional.

Click images to enlarge

The two details above are enlarged from the daily summary spectrum.
The white line is at a frequency of 16 MHz.
The upper edge is near 30 kHz.
The black time ticks are at 20 and 21 UT.

Active region 11069 also produced an X-ray class C2.4 flare, starting near 2004 UT, a few minutes before the radio burst.

My thanks to the STEREO, GOES, and SOHO Observatory Teams.