Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cha%26a..27..426x&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 27, Issue 4, p. 426-434.
Astronomy and Astrophysics
Astrophysics
1
Sun, Corona-Sun, Magnetic Field-Sun, Radio Radiation
Scientific paper
Using the decimetric (700-1500 MHz) radio spectrometer and the synchronous observational system with high temporal resolution at four frequencies (1420, 2130, 2840 and 4260 MHz) of Yunnan Observatory, two rare events were observed on 2001 June 24 and 1990 July 30. The former was a small radio burst exhibiting pulsations with short periods (about 29, 40 and 100 ms) in the impulsive phase. The latter was a large radio burst, which at 2840 MHz produced radio pulsations with period of about 30 ms. This paper focuses on pulsations with very short periods in the range of 29-40 ms. The mechanism of generation of such pulsations may be modulation of radio radiation by the periodic trains of whistler packets originating in unstable regions of the corona. Alternatively, these pulsations can be attributed to wave-wave non-linear interactions of electrostatic upper hybrid waves driven by beams of precipitating electrons in flaring loops.
Li Wei-Hua
Shi Shuo-Biao
Wang Min
Xie Rui-Xiang
Xu Chun
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