Reflection of electromagnetic waves by density gradients in a magnetised plasma

Details Reflection of electromagnetic waves by density gradients in a magnetised plasma Reflection of electromagnetic waves by density gradients in a magnetised plasma

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43...81l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 43, Jan. 1981, p. 81-86.

Physics

7

Earth Magnetosphere, Plasma Density, Plasma-Electromagnetic Interaction, Space Plasmas, Wave Reflection, Whistlers, Approximation, Field Theory (Physics), Magnetospheric Electron Density

Scientific paper

The reflection of electromagnetic waves by density gradients in a plasma with a magnetic field derived from a scalar potential is studied. Conditions are found for reflection at grazing incidence at a surface S containing field lines. No restriction is placed on the angle between the wave-normal and the field, and account is taken of the curvature of the surface and the anisotropy of the medium. Particular reference is made to whistler-mode waves in the magnetosphere. The minimum electron density enhancement needed for reflection is calculated. Guidance by small-scale irregularities and 'super whistlers' (whistlers with upper cut-off above one-half the equatorial electron cyclotron frequency) are briefly discussed.

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