Solar type II radio bursts: emission from shock segments with a collapsing trap geometry?

Details Solar type II radio bursts: emission from shock segments with a collapsing trap geometry? Solar type II radio bursts: emission from shock segments with a collapsing trap geometry?

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..335m&link_type=abstract

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

Physics

3

Sun: Radio Emission, Shock Waves, Mhd

Scientific paper

The nature of the band-split type II burst radio emission is discussed. Examples are shown in which the extrapolations of band-split lanes of type II bursts recorded in the hekto-kilometric wavelength range fit to the local frequency jump caused by the passage of the associated interplanetary MHD shock wave at 1 AU. Such cases favour the interpretation of band-split in terms of the emission from the upstream and downstream shock region. On the other hand type II bursts sometimes show relative band-splits smaller than 10%, indicating that even low amplitude shocks can excite the type II burst emission. This implies that an additional mechanism is accelerating electrons at such shocks. It is proposed that the band-split type II emission is excited at quasi-perpendicular shock segments forming a collapsing trap geometry. In such a configuration a particular magnetic field line intersects the shock front twice forming a system of two approaching magnetic mirrors in which electrons can be accelerated.

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