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Spectral and spatial observations of microwave spikes and zebra structure in the short radio burst of May 29, 2003 View all abstracts by submitter

Nataliia Meshalkina   Submitted: 2011-11-23 22:30

The unusual radio burst of May 29, 2003 connected with the M1.5 flare in AR10368 has been analyzed. It was observed by the Solar Broadband RadioSpectrometer (SBRS/Huairou station, Beijing) in the 5.2-7.6 GHz range. Itproved to be only the third case of a neat zebra structure appearing among allobservations at such high frequencies. Despite the short duration of the burst(25 s), it provided a wealth of data for studying the superfine structure withmillisecond resolution (5 ms). We localize the site of emission sources in theflare region, estimate plasma parameters in the generation sites, and suggestapplicable mechanisms for interpretating spikes and zebra-structure generation.Positions of radio bursts were obtained by the Siberian Solar Radio Telescope(SSRT) (5.7 GHz) and Nobeyama radioheliograph (NoRH) (17 GHz). The sources inintensity gravitated to tops of short loops at 17 GHz, and to long loops at 5.7GHz. Short pulses at 17 GHz (with a temporal resolution of 100 ms) areregistered in the R-polarized source over the N-magnetic polarity(extraordinary mode). Dynamic spectra show that all the emission comprisedmillisecond pulses (spikes) of 5-10 ms duration in the instantaneous band of 70to 100 MHz, forming the superfine structure of different bursts, essentially inthe form of fast or slow-drift fibers and various zebra-structure stripes. Fivescales of zebra structures have been singled out. As the main mechanism forgenerating spikes (as the initial emission) we suggest the coalescence ofplasma waves with whistlers in the pulse regime of interaction betweenwhistlers and ion-sound waves. In this case one can explain the appearance offibers and sporadic zebra-structure stripes exhibiting the frequency splitting.

Authors: G. P. Chernov, R. A. Sych, N. S. Meshalkina, Y. Yan, and C. Tan
Projects: None

Publication Status: A&A in press
Last Modified: 2011-11-24 02:52
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