Landau Damping of Auroral HISS.

Details Landau Damping of Auroral HISS. Landau Damping of Auroral HISS.

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........90m&link_type=abstract

Thesis (PH.D.)--THE UNIVERSITY OF IOWA, 1992.Source: Dissertation Abstracts International, Volume: 54-02, Section: B, page: 090

Computer Science

Scientific paper

Auroral hiss is observed to propagate over distances comparable to an Earth radius from its source in the auroral zone. In this paper the role of Landau damping is investigated for upward propagating auroral hiss. Using a ray tracing code and a simplified model of the distribution function, the effect of Landau damping is calculated as the wave propagates through the environment around the auroral zone. It is found that Landau damping puts a lower limit on the wavelength of auroral hiss. Poleward of the auroral zone, the particle energy is found in a typical case to limit the resonance energy to a value of ~3.2 keV or greater and to limit the wavelength to a value of about 2 km or greater. For equatorward propagation, the resonance energy must be greater than 10 keV and the wavelength must be greater than 3 km to avoid unacceptably large damping. Landau damping is found to be a likely mechanism for explaining some of the one-sided auroral hiss funnels observed by Dynamics Explorer 1, although we cannot account in detail for cases showing equatorward propagation. Upgoing electron beams of energy high enough to generate auroral hiss of the inferred wavelengths are not usually observed. Partial transmission involving interfaces oblique to the magnetic field is considered as a possible wavelength conversion mechanism.

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