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Title:
The auroral plasma cavity
Authors:
CALVERT, W.
Affiliation:
AA(Iowa, University, Iowa City, Iowa)
Journal:
Geophysical Research Letters, vol. 8, Aug. 1981, p. 919-921.
Publication Date:
08/1981
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
AURORAL ZONES, CYCLOTRON FREQUENCY, KILOMETRIC WAVES, MAGNETIC FIELD CONFIGURATIONS, PLASMA DENSITY, PLASMA FREQUENCIES, GEOMAGNETISM, HAWKEYE SATELLITES, PLASMA WAVES, SPECTRUM ANALYSIS
Bibliographic Code:
1981GeoRL...8..919C

Abstract

A region of diminished plasma density has been found to occur at the source of auroral kilometric radiation (AKR). The density within this auroral plasma cavity, determined from limited Hawkeye wave data, was less than 1/cu cm from 1.8 to 3 earth radii geocentric, at 70 deg + or - 3 deg invariant magnetic latitude. The altitude variation of the magnetic field produces a minimum in the ratio of plasma frequency to cyclotron frequency within the cavity which accounts for the observed spectrum of AKR.

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