Excitation of high-frequency electromagnetic waves by energetic electrons with a loss cone distribution in a field-aligned potential drop

Details Excitation of high-frequency electromagnetic waves by energetic electrons with a loss cone distribution in a field-aligned potential drop Excitation of high-frequency electromagnetic waves by energetic electrons with a loss cone distribution in a field-aligned potential drop

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.8671f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol 99, no. A5, p. 8671-8686

Physics

Plasma Physics

10

Auroral Zones, Birkeland Currents, Current Sheets, Electric Potential, Electromagnetic Wave Transmission, Magnetohydrodynamic Stability, Masers, Plasma Currents, Plasma Drift, Propagation Modes, Radio Auroras, Mathematical Models, Plasma Physics

Scientific paper

The electron cyclotron maser instability (CMI) driven by momentum space anisotropy (df/dp (sub perpendicular) greater than 0) has been invoked to explain many aspects, such as the modes of propagation, harmonic emissions, and the source characteristics of the auroral kilometric radiation (AKR). Recent satellite observations of AKR sources indicate that the source regions are often imbedded within the auroral acceleration region characterized by the presence of a field-aligned potential drop. In this paper we investigate the excitation of the fundamental extraordinary mode radiation due to the accelerated electrons. The momentum space distribution of these energetic electrons is modeled by a realistic upward loss cone as modified by the presence of a parallel potential drop below the observation point. On the basis of linear growth rate calculations we present the emission characteristics, such as the frequency spectrum and the emission angular distribution as functions of the plasma parameters. We will discuss the implication of our results on the generation of the AKR from the edges of the auroral density cavities.

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