Other
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619013m&link_type=abstract
Journal of Geophysical Research Supplement (ISSN 0148-0227), vol. 96, Oct. 30, 1991, p. 19,013-19,021.
Other
7
Cold Plasmas, Neptune (Planet), Planetary Magnetospheres, Planetary Radiation, Plasma Density, Plasma Waves, Cyclotron Radiation, Planetary Magnetic Fields, Plasma Temperature, Radiation Trapping, Voyager 2 Spacecraft
Scientific paper
One of the strongest plasma wave signals observed during the Voyager 2 encounter with Neptune is a narrowband emission between 3.0 and 4.3 kHz that was detected over a period of roughly 2 hours around closest approach. The emission occurs below the electron cyclotron frequency and the low-frequency cutoff of the radio continuum radiation. Of the naturally occurring signals in the earth's auroral zone and in Jupiter's magnetosphere this emission most resembles trapped Z mode waves found near the left-hand cutoff frequency. Using this identification, a plasma density profile is obtained that is independent of the plasma temperature. These densities greatly exceed those measured by the plasma science instrument on Voyager but are lower than estimates based on other models of Neptunian plasma wave phenomenology. If this wave mode is not a natural emission, it might arise from an unusual interaction of the spacecraft with the cold, dense ambient plasma.
Coroniti Ferdinan V.
Moses Stewart L.
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