Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003soph..218..197k&link_type=abstract
Solar Physics, v. 218, Issue 1, p. 197-210 (2003).
Physics
24
Scientific paper
The formation of a radio-emitting shock wave and its precursor above a flaring active region is investigated during the flare on 12 April 2001. 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 and above expanding soft X-ray loops. The type II precursor is identified as a signature of the reconnection process above the expanding soft X-ray loops which later generate the type II burst. The precursor emission consists of fast reverse drift bursts that reveal electron beams propagating towards the expanding loops and the hard X-ray sources. There is some degree of similarity between the radio bursts and the rising hard X-ray time profile. This suggests a close relation between the precursor and the soft and hard X-ray sources, i.e., signatures of the primary energy release during the flare. We found that the speeds of the expanding loops (<=700 km s-1), of the precursor (~=950 km s-1), and of the type II exciter (~=900-1400 km s-1) are comparable. But the expanding loops have the lowest speed.
Klassen Andreas
Klein Karl-Ludwig
Pohjolainen Silja
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