Long-term study of longitudinal dependence in primary particle precipitation in the north Jovian aurora

Details Long-term study of longitudinal dependence in primary particle precipitation in the north Jovian aurora Long-term study of longitudinal dependence in primary particle precipitation in the north Jovian aurora

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510375l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10375-10388.

Other

54

Airglow, Auroras, Iue, Jupiter Atmosphere, Particle Precipitation, Ultraviolet Spectra, Hydrocarbons, Hydrogen, Oxygen Ions, Polar Regions, Solar Cycles, Temporal Distribution, Jupiter, Precipitation, Auroras, Longitude, Particles, Absorption, Satellite Observations, Iue Satellite, Optical Properties, Depth, Spectra, Hydrocarbons, Atmosphere, Emissions, Energy, Analysis, Comparisons, Magnetic Effects, Polar Regions, Wavelengths, Density, Hydocarbons

Scientific paper

The wavelength-dependent absorption apparent in IUE spectra of the north Jovian aurora is analyzed to determine the column density of hydrocarbons above the altitude of the FUV auroral emission. Both the magnetotail and torus auroral zone models are considered in estimating zenith angles, with very similar results obtained for both models. It is found that the hydrocarbon column density above the FUV emission displays a consistent dependence on magnetic longitude, with the peak density occurring approximately coincident with the peak in the observed auroral intensity. Two distinct scenarios for the longitude dependence of the column density are discussed. In one, the Jovian upper atmosphere is longitudinally homogeneous, and the variation in optical depth is due to a variation in penetration, and thus energy, of the primary particles. In the other, the energy of the primaries is longitudinally homogeneous, and it is aeronomic properties which change, probably due to auroral heating.

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