Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..973p&link_type=abstract
Astronomy and Astrophysics, v.306, p.973
Astronomy and Astrophysics
Astrophysics
6
Sun: Flares, Sun: Radio Radiation, Sun: X-Rays
Scientific paper
A large sample of microwave bursts observed at the Metsaehovi Radio Research Station during 1989-1992 was analysed and the corresponding active regions were classified. The burst-producing active regions could be divided into three types according to their burst features. The bursts recorded at 37GHz (8mm wavelength) were also compared with the GOES soft X-ray data. The gradual rise and fall type burst fluxes showed almost linear correlation with soft X-ray fluxes, but no common denominator could be found for those radio bursts that lacked a counterpart at soft X-rays. Most of the impulsive microwave bursts were found to start and peak just before the soft X-ray maximum, while many of the gradual bursts started soon after the X-ray onset and peaked after the X-ray maximum. The X-ray flux rise before microwave onset was found to correlate with the maximum X-ray flux, in both impulsive and gradual burst events, the correlation coefficient depending on the soft X-ray flux.
Pohjolainen Silja
Urpo Seppo
Valtaoja Esko
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