Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983acaps...3...93z&link_type=abstract
(Acta Astrophysica Sinica, vol. 3, no. 2, 1983, p. 93-101) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 7, Sept. 19
Astronomy and Astrophysics
Astrophysics
Solar Flares, Solar Radio Bursts, Synchrotron Radiation, Electron Emission, Energy Spectra, Radiant Flux Density, Type 4 Bursts
Scientific paper
Calculations are presented of the emission factors h1,2(s,Theta) of gyrosynchrotron radiation by nonthermal electrons for different values of the energy spectral index Gamma and different values of the angle between the wave vector and the magnetic field Theta. It is found that for a given harmonic number s, h increases with increasing Theta and decreasing Gamma; whereas for a given Gamma and Theta, h decreases with increasing s, although the decrease is slow for G = 1 and Theta = 90 deg. This result indicates that electrons propagating in the transverse direction have greater emissive power than those in the longitudinal direction, producing a flux density several times higher. Calculations of the radio burst spectrum for Theta = 90 deg show that, for Gamma = 1, the lower hormonics give two peaks at 300 MHz and 9000 MHz and a trough in between, due to strong gyroresonance absorption at the higher frequency portions. It is determined that the outburst of August 4, 1972, was probably produced by approximately 10 to the 32nd to 10 to the 34th nonthermal electrons with a spectral index of about 1.5, in transverse propagation, and subject to strong absorption from gyroresonance with thermal electrons.
An Xiang-Lan
Zheng Xing-Wu
Zhou Ai-Hua
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