Electrostatic waves in the magnetosphere of Uranus

Details Electrostatic waves in the magnetosphere of Uranus Electrostatic waves in the magnetosphere of Uranus

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9215225k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 30, 1987, p. 15225-15233.

Physics

Plasma Physics

31

Electron Cyclotron Heating, Electrostatic Waves, Magnetic Equator, Planetary Magnetic Fields, Planetary Magnetospheres, Uranus (Planet), Electron Density (Concentration), Plasma Physics, Plasma Waves, Resonant Frequencies, Voyager 2 Spacecraft

Scientific paper

During its encounter with Uranus the plasma wave receiver on Voyager 2 observed electrostatic waves similar in many respects to those observed in other planetary magnetospheres. The most prominent type observed was the Bernstein mode emissions between harmonics of the electron cyclotron frequency. As is the case at other planets, the most intense Bernstein waves were observed near the magnetic equator of the planet, even though the tilt of the Uranian magnetic moment with respect to the rotational axis is very large. A small offset in the location of these electrostatic waves from the equator predicted by the offset, tilted dipole magnetic field model suggests some warping of the magnetic equator due to ring currents or external currents flowing on the magnetopause. Other examples of electrostatic Bernstein waves were observed closer to the planet and at higher magnetic latitudes. The existence of the Bernstein modes near the upper hybrid resonance frequency leads to estimates of the electron density at several locations within the Uranian magnetosphere, and these compare well with densities measured by the plasma science investigation.

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