Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..401a&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
Physics
1
Scientific paper
The common analysis of dynamic radio spectrograms with Yohkoh X-ray images yields information about possible associations between nonthermal electron acceleration and changes in hot and dense plasma-magnetic field structures of the corona. Examples are correlated X-ray-jet--electron beam injections (type III/U bursts), motions of X-ray blobs and correlated shock-driven (type II) radio bursts, and sigmoid evolution associated with characteristic type IV burst spectral fine structures. Here, we demonstrate the first identification of the radio signature of a reconnection outflow termination shock during a dynamic flare. Reconnection of magnetic fields is one flare energy release mechanism. During dynamic flares there is formed a system of standing slow and - sometimes - also fast mode shock waves in the space around the diffusion region. This standing fast mode shock is revealed by a zero-drift type II burst between 300 and 400 MHz. It exists more than 30 min starting 1 hour after the impulsive flare on 07 April 1997 in AR 8027. It shows herringbone fine structure and 10% band splitted lanes. We argue for having detected fundamental mode emission. No fundamental-harmonic pattern was observed. Simultaneous imaging observations (Hα, Yohkoh SXT, SOHO EIT) show a postflare loop arcade with a bright soft X-ray cusp. Preferable conditions for the radio detection of the termination shock are a low plasma to magnetic pressure ratio eta upstream of the slow shocks, a low diffusion region rise velocity, and a low reconnection rate. The occurrence of the termination shock is most probable in late stage of flares.
Aurass Henry
Karlicky Marian
Thompson Barbara J.
Vrsnak Bojan
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