Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1657b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Sept. 1990, p. 1657-1660.
Physics
17
Electron Cyclotron Heating, Electrostatic Waves, Ion Cyclotron Radiation, Neptune Atmosphere, Planetary Magnetospheres, Harmonic Radiation, Magnetic Equator, Voyager 2 Spacecraft
Scientific paper
Voyager 2 observations of electrostatic electron and ion cyclotron waves detected in Neptune's magnetosphere are presented. Both types of emission appear in a frequency band above the electron and ion (proton) cyclotron frequencies, respectively, and are tightly confined to the magnetic equator occurring within a few degrees of it. The electron cyclotron modes including an intense upper hybrid resonance emission excited by an unstable loss cone distribution of low-density superthermal electrons. The ion cyclotron waves are interpreted as hydrogen Bernstein modes including an intense lower hybrid resonance emission excited by an unstable ring distribution of low-density pickup N(+) ions deriving from the satellite Triton.
Barbosa Domingos
Cairns Iver H.
Gurnett Donald A.
Kurth Willaim S.
Poynter Robert L.
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