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A mechanism for bursty radio emission in planetary magnetospheres
Author(s) -
Wong H. K.,
Goldstein M. L.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i012p02229
Subject(s) - uranus , physics , jupiter (rocket family) , cyclotron , cyclotron radiation , saturn , outer planets , electron , van allen radiation belt , radiation , plasma , radio wave , planet , instability , magnetosphere , electromagnetic radiation , computational physics , astronomy , optics , spacecraft , nuclear physics , mechanics , quantum mechanics
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.