Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..334d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 334-338.
Astronomy and Astrophysics
Astrophysics
12
Energetic Particles, Plasma-Electromagnetic Interaction, Space Plasmas, Wave Propagation, Wave Scattering, Interplanetary Medium, Plasma Temperature, Propagation Modes, Wave Dispersion
Scientific paper
Solutions to the dispersion relation for waves propagating parallel to the ambient magnetic field in a plasma of arbitrary β are obtained, where β is the ratio of the thermal pressure to the magnetic pressure. The results of previous authors for wave frequencies, ω, much less than the ion cyclotron frequency, Ωi, are extended to include all frequencies less than the electron cyclotron frequency, Ωe. It is found that the cyclotron turnovers, which occur at Ωe(Ωi) for the right-hand (left-hand) circularly polarized waves in a cold plasma, occur at significantly lower frequencies in a finite β plasma. The precise limitations of the "high β" approximation are established and details of wave propagation in plasmas with intermediate values of β are examined.
Davila Jose Manuel
Scott Joshua S.
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