Type II precursor and X-ray flare emission

Details Type II precursor and X-ray flare emission Type II precursor and X-ray flare emission

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..307k&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

2

Sun: Flares, X-Rays, Shock Waves

Scientific paper

The formation of a radio emitting shock wave and its precursor above a flaring active region during the flare on 12 April 2001 is investigated. Using combined spectral and imaging observations of radio bursts with Yohkoh soft and hard X-ray imaging observations, we confirm earlier findings that the type II bursts are generated in association with an above the expanding soft X-ray loops. The type II precursor is identified as signature of a propagating disturbance which is later transformed into a type II burst. The observation of reverse drift bursts belonging to the precursor suggests that the precursor is an accelerator of electron beams and has a close relation to the soft and hard X-ray sources. We found that the speeds of the expanding loops, of the precursor, and of the type II exciter are comparable. The expanding loops however have the lowest speed.

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