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Astron. Astrophys. 348, 1005-1011 (1999)

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Fourier and wavelet analysis of type 42 SER and 41 F solar radio bursts

H. Mészárosová, K. Jiika and M. Karlický

Astronomical Institute of the Academy of Sciences of the Czech Republic, CZ-25165 Ondejov (radio@asu.cas.cz)

Received 2 February 1999 / Accepted 17 June 1999

Abstract

19 radio bursts (0.01 s time resolution) classified as 42 SER and 41 F types were selected from observations made by the Ondejov 3 GHz radiometer during 1990-1998. On the 2-4 GHz dynamic radio spectrum in most cases these bursts were identified as decimetric DCIM and in the metric range were accompanied by type III radio bursts indicating the plasma emission origin of these bursts. This set of 3 GHz bursts was analyzed by both the Fourier and the wavelet transform methods searching for characteristic periodicities. Statistical parameters of selected bursts were very similar and almost no difference between 42 SER and 41 F was found. The analysis of the 42 SER and 41 F radio bursts on 3 GHz shows that the number of periods is increasing with decreasing periods, forming a power-law distribution. The dominant periods of the 3 GHz radiation are discussed in the framework of the recent RLC-circuit model with current-carrying magnetic loops. On the basis of this interpretation the electric current densities in the magnetic loops were estimated in the 0.01-0.1 A m-2 range.

Key words: acceleration of particles – methods: data analysis – Sun: activity – Sun: flares – Sun: magnetic fields – Sun: radio radiation

Send offprint requests to: H. Mészárosová

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© European Southern Observatory (ESO) 1999

Online publication: August 13, 199
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