Spatial and diurnal features of the Jovian equatorial anomaly

Details Spatial and diurnal features of the Jovian equatorial anomaly Spatial and diurnal features of the Jovian equatorial anomaly

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..117t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Jan. 1986, p. 117-124.

Computer Science

3

Diurnal Variations, Equatorial Regions, Jupiter Atmosphere, Planetary Ionospheres, Anomalies, Drift Rate, Ionospheric Electron Density, Magnetic Dipoles, Neutral Atmospheres, Jupiter, Diurnal Variations, Features, Equatorial Regions, Anomalies, Time Dependency, Models, Ionosphere, Electrodynamics, Drift, Velocity, Amplitude, Comparisons, Ionization, Latitude, Electrons, Density, Patterns, Experiments

Scientific paper

This paper outlines a time-dependent model of the Jovian ionosphere with electrodynamic drift to study the spatial and temporal features of the Jovian equatorial anomaly. Two sinusoidal drift velocity models are considered, model 1, akin to that in the terrestrial ionosphere and model 2, having opposite phase. The drift velocity amplitude is taken to be 100 m/s. In either model, an equatorial anomaly which persists throughout the day unlike its terrestrial counterpart, and disappears after midnight is obtained. The crest of ionization is centered around 7-8 degrees latitude in either model as compared with about 15 degrees for the terrestrial anomaly. The Rm index attains a maximum value of 2.6 in the afternoon in model 2. The peak electron density at the equator minimizes before midnight in model 1, but after sunrise in model 2. There is no 'noon biteout' like that found in the terrestrial equatorial ionosphere. The height of the peak electron density roughly follows the drift velocity pattern. Comparison with experimental data indicates that drift velocity amplitudes far exceeding 100 m/s would be required to produce the observed Jovian equatorial anomaly.

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