Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..690s&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, Oct. 1991, p. 690-695. Research supported by NERC.
Physics
5
Earth Magnetosphere, High Temperature Plasmas, Landau Damping, Low Frequencies, Whistlers, Electric Fields, Electron Distribution, Magnetic Fields, Radio Emission, Wave Propagation
Scientific paper
An expression is derived for the growth (gamma greater than 0) and damping (gamma less than 0) coefficients of whistler-mode waves in a hot plasma for waves propagating at an angle to the external magnetic field, on the assumption that the propagation itself is unaffected by the finite electron temperature. In the case of a Maxwellian distribution of the electrons with respect to velocities parallel to the magnetic field, the expression for gamma predicts rather strong damping of oblique whistler-mode waves unless their wave normal angles are close to zero. This means that only waves propagating almost parallel to the magnetic field are likely to be excited due to the temperature anisotropy of the electrons (T perpendicular greater than T parallel), and this should be taken into account when interpreting observations of natural whistler-mode radio emissions in the earth's magnetosphere. It is pointed out that Landau damping (or the corresponding instability) of the waves under consideration results mainly from the energy exchange between the electrons and the component of the wave electric field parallel to the external magnetic field B sub zero. The energy exchange between the electrons and the component of the wave electric field perpendicular to B sub zero mainly contributes to the cyclotron damping or growth of the waves, although the role of this process in Landau damping (or the corresponding instability) may not be negligibly small.
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