Drifting decimetric pulsation structures in the initial phase of solar flares

Details Drifting decimetric pulsation structures in the initial phase of solar flares Drifting decimetric pulsation structures in the initial phase of solar flares

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..653k&link_type=abstract

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

Physics

Eruptive Solar Flares, Radio Drifting Pulsations

Scientific paper

Two new cases of slowly negatively drifting pulsation structures in the decimetric wavelength range are reported. It is shown that the August 18, 1998 flare started with a slowly drifting pulsation structure associated with a plasmoid ejection observed by Yohkoh/SXT. This drifting pulsation structure is an example of a narrow-band one, which even shows intensity enhancements at its high- and low-frequency edges. Using the cross-correlation method no significant relation between the radio emission of this drifting structure and the hard X-rays was found. On the other hand, the second drifting structure observed during the hard X-ray decay phase of the March 24, 2000 flare shows a clear separation from the large-scale coronal shock wave released by the flare (a partly simultaneous type II radio burst occurred at much lower frequencies). The slowly drifting structures are analyzed and possible underlying physical processes are discussed assuming the plasmoid ejection model of eruptive solar flares.

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