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Title:
Auroral hiss, Z mode radiation, and auroral kilometric radiation in the polar magnetosphere - DE 1 observations
Authors:
GURNETT, D. A.; SHAWHAN, S. D.; SHAW, R. R.
Affiliation:
AC(Iowa, University, Iowa City, IA)
Journal:
Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 329-340. Navy-supported research.
Publication Date:
01/1983
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
AURORAL ZONES, EARTH MAGNETOSPHERE, HISS, KILOMETRIC WAVES, PLASMA WAVES, RADIO EMISSION, POLAR REGIONS, WAVE PROPAGATION, WHISTLERS
Bibliographic Code:
1983JGR....88..329G

Abstract

The polar-orbiting DE 1 spacecraft has provided the first measurements of high-latitude auroral phenomena. Three types of plasma-wave emissions were observed: auroral hiss, Z-mode radiation, and auroral kilometric radiation. Whistler mode auroral hiss emissions were observed on virtually every pass over the auroral zone. The shape of the auroral hiss frequency-time spectrum is explained by a whistler mode propagation effect if the radiation is emitted from a spatially localized source below the spacecraft. Broadband Z emissions have been observed in the low-density region over the auroral zone and polar cap. The auroral hiss may be distinguished from the Z-mode radiation by the sharp upper cutoff of the whistler mode at the local electron plasma frequency. Auroral kilometric radiation usually occurs at frequencies above electron gyrofrequency, indicating that this radiation is propagating in the free-space R-X mode.

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