An analysis of fine structures in the range 250 - 450 MHz in a radio burst September, 23, 1998

Details An analysis of fine structures in the range 250 - 450 MHz in a radio burst September, 23, 1998 An analysis of fine structures in the range 250 - 450 MHz in a radio burst September, 23, 1998

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..637h&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Radio Burst, Flare, Zebra-Pattern, Fiber-Bursts

Scientific paper

We study some fine structures of a complex radio event observed in the range 100-700 MHz on September 23, 1998; this included a type II burst (06:52-07:02 UT) associated with a flare (3B, M7.1) and followed by a long-lasting type IV continuum. The type II burst was related with ejections of chromospheric mass observed in C IV line (1550 Å) and the formation of a flare coronal hole. Between 08:00 and 08:10 some new fine structures appeared in the range 250-450 MHz and were recorded by the ARTEMIS-IV radio spectrograph; they consisted of a group of fiber bursts, zebra-pattern and fast pulsations in emission and absorption with complex circular polarization. Fine structures were observed simultaneously with the appearance of new magnetic loops on TRACE images in line 195 Å. At 08:03 the position of the radio source centre at 327 MHz (Nançay Radio heliograph) reported on TRACE images results to be above a new formed loop. We thus establish a possible association of fine structures with emerging magnetic loops; the oberved spectral range (280-450 MHz) may be explained by the extension of these loops in the corona.

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