Ultralow frequency MHD waves in Jupiter's middle magnetosphere

Journal Article · Mon May 01 00:00:00 EDT 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JA094iA05p05241· OSTI ID:5947356

Khurana, K K; Kivelson, M G ^[1]

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1. Univ. of California, Los Angeles (USA)

Ultralow frequency (ULF) magnetohydrodynamic pulsations (periods between 10 and 20 min) were observed on July 8-11, 1978 as Voyager 2 traveled through the middle magnetosphere of Jupiter between radial distances of 10 R{sub J} and 35 R{sub J}. The particle and magnetic pressure perturbations associated with the waves were anticorrelated. The electron and ion perturbations on the dayside were in phase. The pressure perturbations occurred both within and outside of the plasma sheet. Perturbations in the transverse components of the magnetic field were associated with the compressional perturbations but the transverse power peaked within the plasma sheet of Jupiter and diminished rapidly outside of it. The absence of finite gyroradius effects in the energetic ion (assumed to be protons) count rates points to perpendicular wavelengths longer than 0.8 R{sub J}. If the pressure perturbations were caused by a convected structure nearly stationary in the plasma rest frame, the azimuthal wavelength was about 2 R{sub J}. A conceptual model of the waves that accounts for the structure of the field and particle observations in the middle magnetosphere of Jupiter is presented.

• OSTI ID: 5947356
• Journal Information: Journal of Geophysical Research; (USA), Vol. 94:A5; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
JUPITER PLANET
PLANETARY MAGNETOSPHERES
HYDROMAGNETIC WAVES
DISTANCE
ELECTRON DENSITY
FLUCTUATIONS
ION DENSITY
MAGNETIC FIELDS
MATHEMATICAL MODELS
VOYAGER SPACE PROBES
ATMOSPHERES
PLANETARY ATMOSPHERES
PLANETS
SPACE VEHICLES
VARIATIONS
VEHICLES
640107* - Astrophysics & Cosmology- Planetary Phenomena