Occurrence of bidirectional type III bursts in solar flares

Details Occurrence of bidirectional type III bursts in solar flares Occurrence of bidirectional type III bursts in solar flares

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ap%26ss.318...87m&link_type=abstract

Astrophysics and Space Science, Volume 318, Issue 1-2, pp. 87-92

Astronomy and Astrophysics

Astrophysics

1

Solar Radio Emission, Type Iii Burst, Solar Activity

Scientific paper

The 13 pairs of type III bursts with the bidirectional drift structures recorded with the spectrograph in the frequency ranges of 230 300 MHz and 625 1500 MHz at the Yunnan Observatory and 2600 3800 MHz at the Beijing National Astronomical Observatories are analyzed in this present article and the outstanding characteristics of these events are obtained. These bursts respectively reveal that the separatrix frequency between the bursts with positive and negative drifts comes between 250 MHz and 3420 MHz, with a gap being between 0.6 MHz and 110 MHz; the duration is 53 ms 1880 ms and the frequency drift rate is between 45 MHz/s and 56000 MHz/s. The drift rate at metric wavelengths is relatively low, only a few decades of MHz while it is comparatively high at microwave wavelengths, reaching 56000 MHz/s. The qualitative explanation of these events is given in this paper.

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