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Radio Physics and Radio Astronomy

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ISSN Druckformat: 2152-274X

ISSN Online: 2152-2758

PROPERTIES OF FAST DRIFTING TYPE III BURSTS AT DECAMETER WAVELENGTHS

Volumen 1, Ausgabe 1, 2010, pp. 11-18
DOI: 10.1615/RadioPhysicsRadioAstronomy.v1.i1.20
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ABSTRAKT

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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