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Issue A&A
Volume 370, Number 1, April IV 2001
Page(s) L13 - L16
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010301



A&A 370, L13-L16 (2001)
DOI: 10.1051/0004-6361:20010301

Extended radio emission after the soft X-ray maximum of the NOAA 9077 AR solar flare on July 10, 2000

Shujuan Wang1, 2, Yihua Yan1, 2 and Qijun Fu1, 2

1  Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, PR China
2  National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China

(Received 22 January 2001 / Accepted 27 February 2001)

Abstract
An extended radio emission after a soft X-ray (SXR) maximum was detected in the active region NOAA 9077 by several observatories for the solar flare after 21:42 UT on July 10, 2000. Also some radio fine structures before the enduring radio emission were observed with the 1.0-2.0 GHz spectrometer of Beijing Astronomical Observatory (BAO) in the same time. We apply a shear-driven quadrupolar reconnection model (SQR) to analyze the fine structures and the related radio emission. We find that the footpoint shear motion of the flux loop is accompanied with the emerging up of the loop during the reconnection process. We tentatively interpret the extended radio emission as the nonthermal radiation caused by a new reconnection process between emerging flux loop and pre-existing overarching loop after the soft X-ray maximum.


Key words: Sun: flare -- Sun: radio radiations

Offprint request: S. J. Wang, wsj@sun10.bao.ac.cn or wsj888@263.net




© ESO 2001


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