A mechanism for bursty radio emission in planetary magnetospheres

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Geophysical Research Letters - November 1990 - Wong - A mechanism for bursty radio emission in planetary magnetospheres.pdf (442.1 KB)

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https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/GL017i012p02229

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https://doi.org/10.1029/GL017i012p02229
 http://hdl.handle.net/11603/30561

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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Author/Creator ORCID

https://orcid.org/0000-0002-5317-988X

Date

1990-11

Type of Work

journal articles
Text

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Program

Citation of Original Publication

Wong, H. K., and M. L. Goldstein. “A Mechanism for Bursty Radio Emission in Planetary Magnetospheres.” Geophysical Research Letters 17, no. 12 (1990): 2229–32. https://doi.org/10.1029/GL017i012p02229.

Rights

This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain Mark 1.0

Subjects

Abstract

Bursty radio emissions are often observed from the polar magnetospheres of the Earth, Jupiter, Saturn, and Uranus in addition to the smooth radio emissions commonly detected. We show that in plasma regimes in which the electron plasma frequency is less than the electron cyclotron frequency, anisotropic electron beams or gyrating electron beams can excite directly broadband electromagnetic radiation. The largest growth is for right-hand X-mode radiation with frequencies above the electron cyclotron frequency. This instability can produce bursty, broadband emission, consistent with some of the properties of the radiation observed from the magnetized planets.