Broadband electrostatic noise and field-aligned currents in Jupiter's middle magnetosphere

Details Broadband electrostatic noise and field-aligned currents in Jupiter's middle magnetosphere Broadband electrostatic noise and field-aligned currents in Jupiter's middle magnetosphere

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8357b&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8357-8369.

Mathematics

Logic

36

Electrostatic Waves, Field Aligned Currents, Jupiter Atmosphere, Noise Spectra, Planetary Magnetospheres, Plasma Currents, Space Plasmas, Atmospheric Electricity, Broadband, Energy Spectra, Ionospheric Currents, Magnetohydrodynamic Stability, Planetary Ionospheres, Voyager 1 Spacecraft, Jupiter, Magnetosphere, Electrostatic Properties, Currents, Observations, Pws, Plasma Wave Subsystem, Emissions, Plasma Sheets, Spectrum, Energy, Morphology, Characteristics, Comparisons, Waves, Magnetic Fields, Data, Ionosp

Scientific paper

Voyager 1 plasma wave observations have revealed the presence of an impulsive electrostatic emission localized to the Jovian middle magnetosphere that appears on the edges of the plasma sheet. This plasma mode has the same spectral and morphological characteristics of an emission that has been extensively studied in the earth's magnetosphere and has been associated with the presence of field-aligned currents. The results of a detailed study of the properties of this Jovian emission are presented by using comparisons with terrestrial observations as a basis for mode identification. The occurrence regions of the waves are compared with the measured magnetic field configuration to establish a correspondence with the plasma sheet. It is argued that this is a quasi-permanent global system of field-aligned currents linking the ionosphere of Jupiter to the middle magnetosphere, which powers energetic plasma heating processes occurring there. On the basis of knowledge of the consequences of field-aligned currents in the terrestrial magnetosphere, a scenario for acceleration/precipitation of inverted V electrons, concomitant aurorae, and energetic (approximately 10 keV) proton deposition into the middle magnetosphere resulting from field-aligned potential drops associated with this current system is suggested.

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