Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.203..317s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 203, no. 2, p. 317-327.
Astronomy and Astrophysics
Astrophysics
High Temperature Plasmas, Ionospheric Propagation, Plasma Frequencies, Plasma-Electromagnetic Interaction, Relativistic Effects, Relativistic Plasmas, Electromagnetic Wave Transmission, Magnetospheric Ion Density, Rarefied Plasmas, Relativistic Theory
Scientific paper
It is pointed out that at frequencies near the plasma cut-off frequencies, the corrections to wave refractive indices in a cold plasma N0 due to the contribution of ions and relativistic effects can be of the same order of magnitude or greater than N0. Expressions for wave refractive indices N taking into account these corrections are derived in a limiting case /N/ much less than 1. It is shown that the increase in cut-off frequencies due to effects of ions is negligibly small unless the electron plasma frequency is well below the electron gyrofrequency. The decrease of the cut-off frequencies due to relativistic effects is significant (1 percent or greater) only in a rather hot plasma (Te of 1 keV or greater), which may be observed in a plasma sheet region of the earth's magnetosphere and in astrophysical conditions. These effects appear to be particularly important in a strongly anisotropic plasma (the electron perpendicular temperature is noticeably greater than the parallel one).
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