每年出版 4 期
ISSN 打印: 2152-274X
ISSN 在线: 2152-2758
PROPERTIES OF FAST DRIFTING TYPE III BURSTS AT DECAMETER WAVELENGTHS
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摘要
First results are reported concerning fast drifting type III-like radio bursts observed at 10 to 30 MHz. More than 1000 cases have been analyzed of the bursts recorded in 2002 to 2004. The frequency drift rates shown by the "fast" variety were several times higher than those of "standard" decameter wavelength type III bursts, while durations were mostly 1 to 2 s. The "fast" bursts were observable, for the most part, on those days when the active region stayed close to the central solar meridian. The explanation suggested for the high rate of the frequency drift of decameter wavelength type III-like bursts takes into account both the group velocity of electromagnetic waves and the speed of radiating electrons.
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