Observationally compatible model for Jupiter's IO-related decametric emission

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6597222

Wang, W

A model for Jupiter's Io-related decametric radiation was adjusted to provide a close fit to observed contours of emission occurrence probability on the plane of Io phase vs. the central meridian longitude for frequencies between 35 and 36 MHz. These observations were reported by Wilson, Warwick, and Libby in 1968. A nonlinear indirect emission mechanism was assumed in which Io-excited Alfven waves produce an electron beam, which in turn, after intermediate steps, results in the emission of fast extraordinary mode electromagnetic waves. This radiation is emitted into a hollow-cone beam attached to the Io flux tube at a point where the wave frequency is slightly higher than the electron cyclotron frequency. A five dipole representation of Jupiter's magnetic field was developed and used in this model; it closely matches of O/sub 4/ field model and has the advantage of greater computational flexibility. The Voyager-determined distribution of electron number density vs. height above the cloud-top level was used. Appropriate adjustments were made to account for the Alfven wave propagation time between Io and the emission point.

• Research Organization: Florida Univ., Gainesville (USA)
• OSTI ID: 6597222
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALFVEN WAVES
BEAMS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
EMISSION
FREQUENCY RANGE
HYDROMAGNETIC WAVES
JUPITER PLANET
LEPTON BEAMS
MAGNETIC FIELDS
MATHEMATICAL MODELS
MHZ RANGE
MHZ RANGE 01-100
PARTICLE BEAMS
PLANETS
RADIATIONS
RADIOWAVE RADIATION
SATELLITES