Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cha%26a...7..211z&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 7, Issue 3, p. 211-215.
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
We give the results of a detailed calculation of the emission factors h1,2 (s,θ) of gyrosynchrotron radiation by nonthermal electrons for different values of the energy spectral index Γ and different values of the angle between the wave vector and the magnetic field θ. For given harmonic number s, h Increases with increasing θ and decreasing Γ. For given Γ and θ, h decreases with increasing s, but the decrease is slow for Γ = 1 and θ = 90°. This shows that electrons propagating in the transverse direction have greater emissive power than those In the longitudinal direction, giving a flux density several times higher.
Using Sturrock's flare model, we calculated the radio burst spectrum for θ = 90°. We found that, for Γ = 1, the lower harmonics give two peaks at 300 MHz and 9000 MHz and a trough in between, due to strong gyroresonance absorption at the higher frequency portions. Our calculation shows that the outburst of 1972 August 4 was probably produced by some 1032-1034 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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