Group velocity of whistlers in a two-ion plasma

Details Group velocity of whistlers in a two-ion plasma Group velocity of whistlers in a two-ion plasma

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3125l&link_type=abstract

Journal of Geophysical Research, vol. 83, July 1, 1978, p. 3125-3135. Research supported by the Norges Almenvitenskapelige Fors

Statistics

Computation

5

Equatorial Atmosphere, Group Velocity, Ionospheric Propagation, Whistlers, Cold Plasmas, Collisionless Plasmas, Graphs (Charts), Helium Hydrogen Atmospheres

Scientific paper

Computations of the group velocity of whistlers in a two-ion plasma show that a quasi-longitudinal (QL) right-handed polarized wave (electron wave) has a minimum group velocity at the so-called crossover frequency; a QL left-handed polarized wave has a maximum group velocity at the same frequency. A quasi-transverse (QT) electron wave has a minimum group velocity at the ion hybrid frequency. In an oxygen/hydrogen plasma this minimum occurs only for almost perpendicular waves, whereas in a helium/hydrogen plasma it occurs also for waves propagating off perpendicular to the magnetic field. We also find that a small concentration of helium in a hydrogen plasma introduces a 'stop band' for quasi-transverse waves with frequencies just above the helium gyrofrequency. The theoretical results are used to interpret satellite observations of quasi-transverse low-frequency whistlers.

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