Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasau...2..367m&link_type=abstract
(Astronomical Society of Australia, Annual General Meeting, 9th, Parkes, New South Wales, Australia, May 14-16, 1975.) Astronomi
Astronomy and Astrophysics
Astronomy
8
Circular Polarization, Continuous Radiation, Plasma Frequencies, Radio Astronomy, Solar Radio Bursts, Spectroheliographs, Brightness Temperature, Frequency Distribution, Plasma Radiation, Polarized Electromagnetic Radiation, Radio Sources (Astronomy), Synchrotron Radiation
Scientific paper
The paper reports observations of seven solar continuum bursts which were made with a radioheliograph at 160, 80, and 43 MHz. The following properties of the bursts are especially noted: (1) their duration varies between 10 and 100 min; (2) the radiation is emitted over a large range of heights, but each frequency peaks near the second harmonic plasma level; (3) the peak brightness temperature varies between 3 million and 5 billion K in all but one case; (4) three events are unpolarized; and (5) the polarization varies from 20% to 70% in the remaining four events. In every case, the radio emission is found to originate from stationary sources whose heights increase with decreasing frequency. Based on this observation, it is concluded that both plasma and synchotron radiation are possible emission mechanisms.
Magun Andreas
Robinson Richard D.
Stewart Ron T.
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