ULF turbulence in the Neptunian polar cusp

Details ULF turbulence in the Neptunian polar cusp ULF turbulence in the Neptunian polar cusp

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3631f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3631-3643.

Physics

1

Magnetic Disturbances, Magnetohydrodynamic Turbulence, Neptune Atmosphere, Polar Cusps, Wave Generation, Planetary Magnetospheres, Power Spectra, Voyager Project, Neptune, Magnetosphere, Magnetopause, Mag Instrument, Reconnection, Voyager 2 Mission, Turbulence, Magnetic Field, Spacecraft Observations, Electrons, Geometry, Power, Source, Frequencies, Spectra, Waves, Origin, Formation, Whistlers, Energy, Amplitude, Boundaries, Auroras, Resonance, Lecp Instrument, Charged Particles, Emissions

Scientific paper

Results of a spectral analysis of the ULF wave turbulence in the Neptunian polar cusp are presented. The activity is characterized as broadbanded, extending up to a maximum frequency of about 0.5 Hz, and having maximum wave amplitudes as large as 6 percent of the dc magnetic field. Activity in the cusp region was particularly intense at its frontside and backside, associated with the magnetopause and cusp/magnetosphere boundaries, respectively. The turbulence, particularly that above f(ci), is tentatively identified as whistler mode. It is argued that such whistler mode turbulence should resonate with electrons having energies in the tens of kiloelectron volts. Observations indicate a very strong correlation of the ULF turbulence with the energetic electrons between 22 and 35 keV measured by Voyager's low-energy charged particle experiment. A vigorous interaction between the two is inferred. ULF wave turbulence in the cusp may represent a significant but not complete power source for the magnetosphere.

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