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EP: Extraterrestrische Physik

EP 17: Sonne: Atmosph
äre

EP 17.2: Fachvortrag

Thursday, March 16, 2006, 09:30–09:45, B

Generation of electrostatic instability due to propagation of plasma jets in the solar corona — •Rossitsa Miteva and Gottfried Mann — Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam

When a jet of hot and dense plasma shooting out from a reconnection site propagates further on through the solar corona, different disturbances in the background medium are naturally expected to occur. We perform a multifluid analysis on a moving flaring plasma stream (solar jet) through some background plasma (solar corona). We look for a set of favourable conditions under which the generated disturbances may grow in time indicating the presence of instability. All theoretical inputs lay in the typically observed range of values for the characteristic coronal parameters. The goal of this study is to show whether such configuration could account also for the observed heating and acceleration of electrons in the solar corona. Beams of mildly relativistic electrons propagating through the corona give rise to the so-called type III and U bursts in the metric radio data. Generally a good spatial and temporal correspondence between the type III/U bursts and the solar (soft X-ray) jets has been already reported. A complete theoretical approach on this issue however is not known. We propose a model for jet associated electrostatic instability and a possible subsequent acceleration of electrons in the solar corona. The numerical results from this study are compared with the outcomes from a data analysis on solar jets and metric radio bursts.