Charged Particle Precipitation into Jupiter's Subauroral Atmosphere

Details Charged Particle Precipitation into Jupiter's Subauroral Atmosphere Charged Particle Precipitation into Jupiter's Subauroral Atmosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p21b0371a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P21B-0371

Mathematics

Probability

2116 Energetic Particles, Planetary, 2455 Particle Precipitation, 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2756 Planetary Magnetospheres (5443, 5737, 6030)

Scientific paper

Energetic charged particle precipitation into Jupiter's subauroral atmosphere is modeled with respect to longitude and latitude. Trapped magnetospheric particles bounce-orbit magnetic field lines mapped by Connerney et al. 1998. Pitch angle scattering is simulated by a probability function originally designed for the terrestrial magnetosphere (Thorne et al. 1996). Satellite and ring influences on the precipitation pattern, such as the absorption and emission of charged particles, are neglected, aside from their contributions to the magnetic field model. Diurnal effects, such as variations in the atmospheric scale height, are not included. The calculations indicate that inner magnetospheric (1.5RJ - 4.0RJ) precipitation is greatest in the Southern Hemisphere, but the interhemispheric differences decline with increasing L, along with the longitudinal variation. The effects of particle mass, charge and energy on the precipitation pattern were negligible for the species (electrons, protons, and singly charged oxygen and sulfur ions), energies (0.3 to 10 MeV) and diffusion rates (0.001 to 0.1 of the strong diffusion rate) considered at 1.5RJ and 2RJ, although species variations were apparent at L=4. Observations of H3+ and x-ray emissions were strongly correlated to our precipitation calculations at 1.5RJ, especially in the Northern Hemisphere, where magnetic field asymmetries are most intense. The correlation between observations and modeled precipitation fluxes diminishes at higher latitudes, particularly for H3+, suggesting that ion transport from auroral latitudes contributes to the observed emissions.

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