Resonance between coherent whistler mode waves and electrons in the topside ionosphere

Details Resonance between coherent whistler mode waves and electrons in the topside ionosphere Resonance between coherent whistler mode waves and electrons in the topside ionosphere

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..255n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 255-265. Sponsorship: Statens Naturvidenskabelige Fo

Physics

18

Coherent Electromagnetic Radiation, Cyclotron Resonance, Ionospheric Electron Density, Plasma Waves, Plasma-Particle Interactions, Whistlers, Earth Magnetosphere, Landau Damping, Magnetic Flux, Plasma Density, Plasma Frequencies

Scientific paper

Landau resonance and cyclotron resonance of coherent whistler mode waves and energetic electrons are explored for magnetoplasmas with appreciable gradients in the plasma density and magnetic field strength. It is shown that in the topside ionosphere of the earth near the ion transition height the gradients in plasma density and magnetic field strength along a magnetic field line may match in a way which enhances both Landau and cyclotron interactions between waves and electrons at the loss cone pitch angle. The pitch angle scattering induced by a signal from a ground-based VLF transmitter in the ionosphere above the transmitter has been estimated and compared to the pitch angle scattering induced by naturally occurring ELF hiss through cyclotron resonance. It is found that the expected scattering due to plasmapheric hiss is an order of magnitude larger than that due to Landau resonance in the topside ionosphere. Pitch angle scattering due to cyclotron resonance in the topside ionosphere, however, may be larger by a factor of 2. It is suggested that the 'fast Trimpi' effect may be caused by a cyclotron resonance interaction in the topside ionosphere.

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