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Periodic Acceleration of Electrons in the 1998 November 10 Solar Flare View all abstracts by submitter

Kiyoto Shibasaki   Submitted: 2001-10-16 23:27

We present an examination of the multi-wavelength observation of a C7.9 flare which occurred on 1998 November 10. This is the first time of imaging observation of the quasi-periodic pulsations (QPPs). Four bursts were observed with the hard X-ray telescope aboard Yohkoh and the Nobeyama Radioheliograph during the impulsive phase of the flare. In the second burst, the hard X-ray and microwave time profiles clearly showed a QPP. We estimated the Alfvén transit time along the flare loop using the images of the soft X-ray telescope aboard Yohkoh and the photospheric magnetograms, and found that the trnasit time was almost equal to the period of the QPP. We therefore suggest, based on a shock acceleration model, that variations of macroscopic magnetic structures, such as oscillations of coronal loops, affect the efficiency of particle injection/acceleration.

Authors: A. Asai, M. Shimojo, H. Isobe, T. Morimoto, T. Yokoyama, K. Shibasaki, and H. Nakajima

Publication Status: ApJL(in press)
Last Modified: 2001-10-16 23:27
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