EDP Sciences
Free access
Volume 375, Number 1, August III 2001
Page(s) 243 - 250
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20010782

A&A 375, 243-250 (2001)
DOI: 10.1051/0004-6361:20010782

Global statistics of 0.8-2.0 GHz radio bursts and fine structures observed during 1992-2000 by the Ondrejov radiospectrograph

K. Jiricka, M. Karlický, H. Mészárosová and V. Snízek

Astronomical Institute of the Academy of Sciences of the Czech Republic, 25165 Ondrejov, Czech Republic
    e-mail: radio@asu.cas.cz

(Received 14 March 2001 / Accepted 28 May 2001)

681 solar radio events observed by the Ondrejov 0.8-2.0 GHz radiospectrograph during 1992-2000 are analyzed and corresponding bursts and fine structures classified into ten different classes. A new rare type of fine structure with rapid frequency variation we called lace pattern was included. Drifting pulsation structures, observed usually at the beginning of the impulsive flare phase, were recognized among pulsations. Furthermore, a new sub-class of zebra patterns with many zebra lines (~30) superimposed on fibers was identified. For all defined types of burst and fine structures basic characteristics of their parameters are presented. Distributions of various types of burst and fine structures in the years 1992-2000 in dependence on the changes of solar activity during the cycles 22 and 23, occurrences of studied types of burst in association with GOES class flares as well as their relationship to GOES flare maxima are shown. Finally, the association of the analyzed bursts with the metric type III bursts observed at Potsdam-Tremsdorf Observatory was studied.

Key words: plasmas -- Sun: flares -- Sun: radio radiation -- methods: data analysis -- methods: statistical

Offprint request: K. Jiricka, jiricka@asu.cas.cz

© ESO 2001