Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..813t&link_type=abstract
Astronomy Reports, Volume 42, Issue 6, November 1998, pp.813-818
Astronomy and Astrophysics
Astronomy
Scientific paper
We analyze in detail the dynamic characteristics (frequency drift rate df/dt = f(f) and duration tau(f)) of meter-wave solar microbursts observed at two radio observatories in the USA and India at f ~ 50 MHz. The average measured characteristics of harmonically related type III bursts over a wide wavelength range from 1 to 50 m were used as a reference in our study. Our results support the hypothesis that meter-wave microbursts are related to weak type III emission. The drift rates of microbursts fall into two groups, in the same way as normal, intense type III bursts; these groups are associated with the first (F) and second (H) harmonics of the local plasma frequency f_p in the solar corona. The majority (about 80%) of the observed microbursts are characterized by essentially the same parameters f(f) and tau(f) as type IIIH bursts. Like comparatively short type IIIF bursts, the other group of microbursts has higher (by approximately a factor of 1.6) drift rates. The dynamic characteristics of the microbursts provide evidence that weak meter-wave type III bursts are generated at both the fundamental (f ~ f_p) and second-harmonic (f ~ 2f_p) frequencies. Observations indicate that the probability of detecting a weak burst at the fundamental frequency (IIIF) is relatively small, and, on the whole, microbursts at the second-harmonic frequency (IIIH) dominate.
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