Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991acasn..32..247q&link_type=abstract
(Acta Astronomica Sinica, vol. 32, no. 3, 1991, p. 247-251) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 16, no. 1,
Astronomy and Astrophysics
Astrophysics
1
Fine Structure, Solar Radio Bursts, Magnetohydrodynamic Waves, Plasma Oscillations, Solar Flares, Solar Magnetic Field, Synchrotron Radiation
Scientific paper
This paper describes the quasi-periodic fine structures (FS) in a solar radio burst which was observed with time resolution of 10 ms at 3.2 cm wavelength on 23 May 1990. The radio burst was associated with a M8.7/1B flare occurred in the active region AR 6063. The average period of these fine structures is about 1.5 s, and the amplitude modulation range from 2 to 5 percent. A preliminary analysis shows that there is a linear relation between the mean flux S of the radio burst and the repetition rate R of the quasi-periodic fine structures at 3.2 cm wavelength. This relation is similar to that obtained by Kaufmann et al. in millimeter wavelength region. It is suggested that these quasi-periodic fine structures probably reflect the modulated gyrosynchrotron emission due to MHD waves oscillating along magnetic field lines.
Chen Yun-Xia
Li Chun-Sheng
Qin Zhi-Hai
Wei Shuang-Ling
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