Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acaps..11..352h&link_type=abstract
(Acta Astrophysica Sinica, vol. 11, no. 4, 1991, p. 352-361) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 16, no. 1
Astronomy and Astrophysics
Astrophysics
Electron Cyclotron Heating, Magnetohydrodynamic Stability, Plasma Radiation, Solar Radiation, Background Radiation, Plasma Frequencies, Polarized Radiation, Thermodynamic Equilibrium
Scientific paper
The effect of the plasma background parameter omega(pe)/Omega(e) on spike radiation is discussed on the basis of the theory of electron cyclotron maser instability. Attention is given to the physical meaning of the parameter, its numerical range, and the polarization and harmonics structure of the radiation that are especially sensitive to changes in this parameter. A clear correspondence is found between the polarization of the spike emission and omega(re)/Omega(e). When omega(pe)/Omega(e) is less than 1, the fundamentals of the fast X mode and O mode successively appear, with high right-handed and left-handed circular polarizations, respectively. When omega(pe)/Omega(e) is greater than 1, the second harmonics of fast X and O modes result, and the polarity changes from being right-handed to left-handed. A general theoretical demonstration of the polarity of the O and X modes is provided.
Huang Guang Li
Wang De-yu
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