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26 April 2024 |
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Periodic Acceleration of Electrons in the 1998 November 10 Solar Flare | | A. Asai
; M. Shimojo
; H. Isobe
; T. Morimoto
; T. Yokoyama
; K. Shibasaki
; H. Nakajima
; | | Date: |
1 Nov 2001 | | Journal: | Astrophys.J. 562 (2001) L103 | | Subject: | astro-ph | | Affiliation: | 1 and 2), M. Shimojo , H. Isobe (1 and 2), T. Morimoto , T. Yokoyama , K. Shibasaki and H. Nakajima ( Kwasan and Hida Observatories, Kyoto University, Department of Astronomy, Kyoto University, Nobeyama Radio Observatory | | Abstract: | 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 Alfven transit time along the flare loop using the images of the soft X-ray telescope aboard it Yohkoh and the photospheric magnetgrams, and found that the transit 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. | | Source: | arXiv, astro-ph/0111018 | | Services: | Forum | Review | PDF | Favorites | |
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