Unusual behaviour of zebra-pattern in the event July 28, 1999

Details Unusual behaviour of zebra-pattern in the event July 28, 1999 Unusual behaviour of zebra-pattern in the event July 28, 1999

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..701m&link_type=abstract

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

Physics

1

Solar Flares: Structure, Radio Spectrometry

Scientific paper

On July 28, 1999 between 08:15 and 10:30 UT a radio event including long-lasting zebra-patterns was recorded in the frequency range 45-550 MHz by the IZMIRAN and Phoenix-2 spectrometers. These emissions were related to a small flare (1B M2.3) in AR 8649. After the event maximum, at 08:55, some unusual fiber-bursts appeared with absorption at both low and high frequency edges of the emission stripe. Additionally, some stripes were observed only in absorption. After 10:19 almost all zebra stripes and fiber bursts showed absorption at the high frequency edge. During that interval zebra-stripes formed some cascades with U-burst like changes of the frequency drift (from negative to positive). In such cases fiber-bursts continuously converted into zebra-stripes testifying the common origin of both structures. The frequency bandwidth of the zebra-patterns is probably defined by the vertical dimensions of new emerging flare loops.

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