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Frequency and time properties of decimeter narrowband spikes in solar flares

Published online by Cambridge University Press:  18 July 2013

Shujuan Wang
Shujuan Wang*
Affiliation:
Key Laboratory of Solar Activity / National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China email: wsj@nao.cas.cn
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Abstract

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In this paper, we focus to study the frequency and time properties of a group of spikes recorded by the 1.08-2.04 GHz spectrometer of NAOC on 27 October 2003. At the first we calculate the mean and minimum bandwidth of the spikes. We apply two different methods based on the wavelet analysis according to Messmer & Benz (2000). The first method determines the dominant spike bandwidth scale based on their scalegram, and the second method is a feature detection algorithm in the time-frequency plane. Secondly the time profile of each single spike was fitted and analyzed. In particular, we determined the e-folding rise and decay times corresponding to the ascending and decaying parts of the time profile, respectively. Several important correlations were studied and compared with the results in earlier literature, i.e. those between duration and frequency, e-folding rise time and decay time, e-folding decay time and duration, and e-folding decay time and peak flux. Finally some parameters of source region were estimated and the possible decaying mechanism was discussed.

Keywords

Solarflaredecimeterspike
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 581 - 582
Copyright
Copyright © International Astronomical Union 2013 

References

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Messmer, P. & Benz, A. O. 2000, A&A, 354, 286.Google Scholar
Wang, S., Yan, Y., & Fu, Q. 2002, Solar Phys., 209, 185.Google Scholar