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Astron. Astrophys. 364, 793-798 (2000)

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Microwave M burst on May 3 1999

Z. Ning 1,2,3, Y. Yan 1,3, Q. Fu 1,3 and Q. Lu 2

1 Chinese Academy of Sciences, Beijing Astronomical Observatory, Beijing 100012, P.R. China (ningzongjun@hotmail.com)
2 University of Fudan, Department of Physics, Shanghai 200433, P.R. China
3 Chinese Academy of Sciences, National Astronomical Observatories, Beijing 100012, P.R. China

Received 29 February 2000 / Accepted 11 August 2000

Abstract

We present a remarkable fine structure of "decimetric pulsation" event (DCIM), observed with the 2.60-3.80 GHz spectrometer in Beijing Astronomical Observatory on 3 May 1999; a "M" dynamic spectrum has been detected, thanks to the high time and frequency resolutions. We call this fine structure a microwave M burst and propose a plausible model which treats the observed M burst as an emission produced by the same electron beam travelling along magnetic lines and mirrored; this beam might be originally formed from the plasmoid of a type IV-DCIM burst. The M burst could be another radio evidence of the mirror effect on electron beam after the N-burst. It is the first time that such a feature has been detected in type IV-DCIM bursts.

Key words: Sun: activity – Sun: radio radiation

Send offprint requests to: Zongjun Ning

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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