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Title:
A theory of electron cyclotron waves generated along auroral field lines observed by ground facilities
Authors:
WU, C. S.; YOON, PETER H.; FREUND, H. P.
Affiliation:
AC(Maryland, University, College Park)
Journal:
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1461-1464.
Publication Date:
12/1989
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
AURORAL ZONES, ELECTRON CYCLOTRON HEATING, GROUND STATIONS, LINES OF FORCE, RADIO WAVES, CERENKOV RADIATION, KILOMETRIC WAVES, MAGNETIC FIELDS, WAVE GENERATION
Bibliographic Code:
1989GeoRL..16.1461W

Abstract

A generation mechanism for radio waves in the frequency range 150 - 700 kHz observed by ground facilities is suggested in terms of an electromagnetic electron cyclotron instability driven by auroral electrons. The excited waves can propagate downward along the ambient magnetic field lines and are thus observable with ground facilities. The trapped auroral electrons are supposed to play an important role in the generation process, because they give rise to a thermal anisotropy which consequently leads to the instability. The present work is a natural extension of the theory proposed earlier by Wu et al. (1983) which was discussed in a different context but may be used to explain the observed waves originated at low altitudes. This paper presents a possible wave generation mechanism valid in the entire auroral field-line region of interest.

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