1 4 GHz type II-like radio bursts and pinch processes near the transition region

Details 1 4 GHz type II-like radio bursts and pinch processes near the transition region 1 4 GHz type II-like radio bursts and pinch processes near the transition region

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..163..171k&link_type=abstract

Solar Physics, Volume 163, Issue 1, pp.171-181

Physics

3

Scientific paper

Analyzing 205 radio bursts observed by the Ondřejov radiospectrograph in the 1 4 GHz frequency range during 1992 and 1993, we found 6 examples of type II-like radio bursts coinciding with impulsive phases of solar flares. These bursts were interpreted as radio manifestations of MHD (shock) waves generated during impulsive phases of flares in the vicinity of the transition region. Assuming a magnetic-field perturbation origin of these waves, we studied pinch processes in the current sheet near the transition region. In the 2-D MHD numerical model of this current sheet we demonstrated that 2-D pinch processes induced by radiative losses can trigger the impulsive phase of some flares and so generate the observed high-frequency type II-like radio bursts.

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