Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82...93w&link_type=abstract
Astronomy and Astrophysics, vol. 82, no. 1-2, Feb. 1980, p. 93-98. Research supported by the Swiss National Science Foundation.
Astronomy and Astrophysics
Astrophysics
8
Adiabatic Flow, Microwaves, Plasma Heating, Solar Flares, Solar Radio Bursts, Solar X-Rays, Plasma Oscillations, Radiant Flux Density, Solar Wind, Thermal Energy
Scientific paper
The nature of those quasi-periodic solar microwave bursts which exhibit quasi-periodic modulations only during the rise period is investigated. The quasi-periodic structure of the burst of Mar. 1, 1970, which has been explained by an adiabatic compression of the flare plasma followed by expansion, is examined, and observed quasi-periodic structures of microwave bursts during their rise periods are analyzed in terms of relations obtained from microwave and hard X-ray observations of the March 1 burst. The assumption that all the bursts are caused by a disturbance traveling through the thermal plasma at the Alfven speed during adiabatic compression is found to lead to an index for the power law dependence of flux on plasma temperature which is in agreement with that observed, suggesting that this class of impulsive flares is produced by the adiabatic heating of the common microwave and hard X-ray source.
Maetzler C.
Wiehl H. J.
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