Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..722y&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
During the long lasting solar flare/CME event of 00:44-03:40 UT in NOAA 9906 on 21 April 2002 we observed almost unique complicated microwave zebra pattern structure and fiber bursts during the X1.5 flare maximum at 01:44-02:09 UT with high resolutions (10 MHz and 8 ms) in 2.6-3.8 GHz. The conversions of fiber bursts into zebra stripes and inversely were also observed. We have developed a feature-enhancement technique to detect burst fine structures automatically so as to provide burst parameters statisticaly. These fine structures occurred continuously during the flare peak for more than 20 minutes with some intervals when the zebra patterns are weakly recognized. The sources of these emissions do not lie far up in the corona but rather in the dense core of the flaring active region. So it provides us an opportunity to learn about flare dynamics directly. By comparison with hard X-ray observations we find that the onset of the zebra and fiber bursts was corresponding to the hard X-ray burst.
Fu Qiang
Grechnev Victor V.
Song Guohui
Tan Chenhao
Yan Yiguang
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