Particle Acceleration in the X3 Event on Dec. 13, 2007

Details Particle Acceleration in the X3 Event on Dec. 13, 2007 Particle Acceleration in the X3 Event on Dec. 13, 2007

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9435s&link_type=abstract

American Astronomical Society Meeting 210, #94.35; Bulletin of the American Astronomical Society, Vol. 39, p.223

Astronomy and Astrophysics

Astronomy

Scientific paper

Even during the solar minimum period, the active region NOAA 10930 had a complex magnetic configuration especially around the main sunspot and produced a couple of X-class events. The one on Dec. 13, 2007 was well observed by Nobeyama Radioheliograph (NoRH) and Polarimeters (NoRP). Microwave emission associated with this event has several interesting characteristics:
1. Long lasting non-thermal phase
2. Very large decimetric flux (several thousand times of the quiet sun flux) and quite different time development of decimetric emission compared to shorter wavelengths
3. Very high turn-over frequency (around 35 GHz)
This event was also well observed by HINODE satellite and partially by RHESSI satellite. Optical telescope (SOT) and Soft X-ray telescope (XRT) onboard HINODE showed that the flare started around the polarity reversal line which divides the main sunspot and the closely associated small sunspot with opposite polarity. This line is the interface of the penumbrae of both sunspots. The flare ribbons started in the penumbrae and entered into umbrae of both sunspots.
Microwave images of the event at 17 and 34 GHz are synthesized and compared with optical and soft X-ray images taken by SOT and XRT respectively. Based on these overlays, frequency spectral information (NoRP) and RHESSI images in the later phase of the event, we try to locate particle acceleration site and discuss possible mechanisms of acceleration.
Hinode is an international project supported by JAXA, NASA, PPARC and ESA. We are grateful to the Hinode team for all their efforts in the design, development and operation of the mission. NoRH and NoRP are operated by Nobeyama Solar Radio Observatory, NAOJ. RHESSI is a NASA project.

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