Optically thin H Lyman alpha production on outer planets - Low-energy proton acceleration in parallel electric fields and neutral H atom precipitation from ring current

Details Optically thin H Lyman alpha production on outer planets - Low-energy proton acceleration in parallel electric fields and neutral H atom precipitation from ring current Optically thin H Lyman alpha production on outer planets - Low-energy proton acceleration in parallel electric fields and neutral H atom precipitation from ring current

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.9473b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A6, p. 9473-9481.

Physics

14

Hydrogen Atoms, Lyman Alpha Radiation, Outer Planets Explorers, Particle Acceleration, Proton Energy, Ring Currents, Neutral Atoms, Optical Thickness, Particle Precipitation, Planets, Outer Planets, Gas Planets, Lyman Alpha Radiation, Protons, Production Rate, Acceleration, Electric Field, Neutral Particles, Current, Monte Carlo Methods, Model, Parameters, Emissions, Energy, Numerical Methods, Density, Pitch Angle, Collisions, Uranus, Jupiter, Atmosphere, Hydrogen, Calculations, Resonance, Precipitation, Ch

Scientific paper

A Monte Carlo model has been constructed to describe the energization and energy degradation of low-energy protons in an H2 atmosphere in the presence of parallel electric field. Numerical experiments have been performed to study the effect of initial proton energy, electric field, neutral number density, initial pitch angle, and cutoff limit on H Ly-alpha volume-emission rate. Energization of solar EUV-generated low-energy protons by parallel electric fields is incapable of producing optically thin Ly-alpha emissions on Uranus through direct collision with H2. However, nonthermal H atoms, produced through acceleration of protons in parallel electric fields, play an important role in enhancing the Ly-alpha intensity through resonant scattering of solar Ly-alpha flux; the resulting emissions are consistent with the broadening of the Ly-alpha line observed on Jupiter by IUE. The Monte Carlo model is also applied to the problem of Doppler-shifted H Ly-alpha emissions from the auroral atmosphere of Jupiter.

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