Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46...12z&link_type=abstract
Acta Astronomica Sinica, vol. 46, no. 1, p. 12-18
Astronomy and Astrophysics
Astronomy
Sun: Radio Radiation, Radiation Mechanisms: General, Radiative Transfer
Scientific paper
The characteristics of the self absorption of gyrosynchrotron emission are investigated detail and its optical depth is estimated from radio microwave source with a magnetic dipole field. It is shown that: (1) the self absorptivities dicrease rapidly with increasing harmonic number , so that only these absorptions of the lower harmonics () can affect substantially microwave burst sprectra; (2) this decrease becomes more quickly as increasing energy spectral index and decreasing low-energy cutoff of energetic electrons; (3) increase also obviously as increasing propagation angle and reach maximum in the range of - ; (4) for the optical depths of the self absorption, , are in the range of . This value is lower than that of the gyroresonance absorption, assuming the number density of energetic electrons, N=10. would be overestimated in the uniform magnetic field case. Only when N is larger than can the optical depth of the self absorption compares with one of gyroresonance absorption.
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