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Periodicities in microwave radio bursts of solar flares

Published online by Cambridge University Press:  01 November 2006

Zongjun Ning  and
M. D. Ding
Zongjun Ning
Affiliation:
Purple Mountain Observatory, Nanjing, 210008, China email: [email protected]
M. D. Ding
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China
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Abstract

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We analyze the periodicities for 294 solar flares observed by Nobeyama Radioheliograph over 6 discrete frequencies of 1, 2, 3.75, 9.4, 17 and 35 GHz during the solar cycle 23 between 1998 and 2004. Using Fourier analysis, we pick up the shortest period ($T_{\rm{s}}$) for each event at each frequency channel. We find that $T_{\rm{s}}$ varies in the range of 0.25–0.62 s over 6 frequency channels.

Keywords

Sun: flaresSun: radio radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 421 - 422
Copyright
© 2006 International Astronomical Union