The Reconnection Region With Fast Shock Fronts As A Source Of Microwave Spikes (Based On Soho And Yohkoh Data)

Details The Reconnection Region With Fast Shock Fronts As A Source Of Microwave Spikes (Based On Soho And Yohkoh Data) The Reconnection Region With Fast Shock Fronts As A Source Of Microwave Spikes (Based On Soho And Yohkoh Data)

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..223c&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Computer Science

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Scientific paper

A new model for solar spike bursts is considered based on the interaction of Langmuir waves with ion-sound waves :l+s-->t. Such mechanism can operate in shock fronts, propagating from a magnetic reconnection region. New observations of microwave millisecond spikes are discussed. They have been observed in the event 1997.11.04 between 0552-0610 UT and 1997.11.28 event between 05:00-05:10 UT using multichannel spectrograph in the range 2,6-3.8 GHz of Beijing AO. The first time we describe very fast and narrowband microwave spikes: duration 8 ms, bandwidth 10 MHz. Yohkoh/SXTimages in AR and SOHO EIT images testify a reconstruction of bright loops after the escape of CME in Nov.4 event and X-ray jets in Nov.28 event. Fast shock fronts might be manifested as a narrow very bright line at Te SXT maps ( 18 MK) and as dense structures at Emission Mesure maps. Strong left polarization of spike emission from a source above the leader spot of south magnetic polarity in AR 8100 corresponds in this event to the extraordinary magnetoionic mode. The model gives the ordinary mode of spike emission, therefore we propose the depolarization of the emission in the transverse magnetic field and rather in the vanishing magnetic field in the middle of QT region. The scattering of O-mode into X-mode by whistlers just above the escape level of X-mode can also provide an additional depolarization. Duration and frequency band of isolated spikes are connected with parameters of fast particle beams and shock front.

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