Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acasn..47...46m&link_type=abstract
Acta Astronomica Sinica, vol. 47, no. 1, p. 46-53
Astronomy and Astrophysics
Astronomy
Sun: Radio Radiation, Sun: Activity, Microwave Type Iii Burst
Scientific paper
Type III bursts 266 in total observed with the 2.6--3.8,GHz high temporal resolution dynamic spectrometer of NAOC during the 23 rd solar cycle,(from April 1998 to January 2003) are statistically analyzed. The frequency drift rates,(normal and reverse slop), durations, polarizations, bandwidth, starting and ending frequencies are analyzed in detail. From the statistical results of starting and ending frequencies it is shown that the range of starting frequencies is very large from less than 2.6GHz to greater than 3.8 GHz; but the ending frequency range is relatively narrow from 2.82,GHz to 3.76,GHz. These phenomena mean that the sites of electrons acceleration are quite scattered, while the cutoff regions of the radio type III bursts are in the limiting domain. The burst number with positive and negative drift rates are nearly equal. This correlation may suggest the same proportion of electron beams in the directions of upward and downward, accelerated in the range of 2.6--3.8,GHz. The emission mechanisms of microwave type III bursts are mainly caused by the plasma radiation and electron gyro-maser radiation. Usually, there are two excitements to produce type III bursts: electron beam-drive and loss cone-drive type III bursts. Their magnetic configurations mainly contain two types: opening or closed magnetic structures.
Ma Yi
Xie Rui Xiang
Yan Yi-Hua
Zheng Xiang-Ming
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