Analysis of the Disappearing Filament and Flare of 7May1992

Details Analysis of the Disappearing Filament and Flare of 7May1992 Analysis of the Disappearing Filament and Flare of 7May1992

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..185..143t&link_type=abstract

Solar Physics, v. 185, Issue 1, p. 143-155 (1999).

Physics

10

Scientific paper

By using Yohkoh soft X-ray data, Hα filtergrams, and radio data, the activation of the disappearing filament and the flare eruption on 7 May 1992 have been studied. Main conclusions are as follows: (1)the emergence of new magnetic flux tends to affect the pre-existing X-ray loops, which usually appear in arcades spanning Hα filament, changing the magnetic environment of the filament, and then enhance the current in the filament. Therefore newly emerging flux plays a fundamental role in the destabilization of this filament. (2)According to the Hα data and the rising motion of the filament, the corresponding current variation in the filament has been calculated. It seems that the current interruption may be a possible trigger mechanism for this filament disappearance. (3)The magnetic field strength and the energy flux of energetic electrons in the source region of microwave bursts have been estimated by using the microwave spectrum. During the main phase, the mean magnetic strength and the energy flux of energetic electrons are about 300-400G and 1x1011ergcm-2s -1, respectively. (4)The energy provided by reconnection of the current sheet and the total energy of the current filament are estimated and we show that there is enough energy stored in the filament to feed the 7 May, 1992 flare.

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