Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cha%26a..16...78q&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 16, Issue 1, p. 78-83.
Astronomy and Astrophysics
Astrophysics
Solar Radio Burst-Fine Structure-Repetition Rate
Scientific paper
This paper describes the quasi-periodic fine structures (FS) in a solar radio burst which was observed with time resolution of 10ms at 3.2cm 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 1.5s and the amplitude modulation range from 2% to 5%.
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 quasiperiodic fine structures at 3.2cm wavelength. This relation is similar to that obtained by Kaufmann et al. in millimeter wavelength region.
We suggest that these quasi-periodic fine structures probably reflect the modulated gyro-synchrotron 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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