An explanation for the H Ly-alpha longitudinal asymmetry in the equatorial spectrum of Jupiter - an outcrop of paradoxical energy deposition in the exosphere

Details An explanation for the H Ly-alpha longitudinal asymmetry in the equatorial spectrum of Jupiter - an outcrop of paradoxical energy deposition in the exosphere An explanation for the H Ly-alpha longitudinal asymmetry in the equatorial spectrum of Jupiter - an outcrop of paradoxical energy deposition in the exosphere

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.2673s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, March 1, 1985, p. 2673-2694.

Physics

65

Equatorial Atmosphere, Exosphere, Hydrogen Atoms, Jupiter Atmosphere, Lyman Alpha Radiation, Planetary Radiation, Atmospheric Chemistry, Auroras, Emission Spectra, Planetary Ionospheres, Rydberg Series, Voyager 2 Spacecraft, Jupiter, Lyman Alpha Radiation, Spectra, Equatorial Regions, Energy, Source, Origin, Exosphere, Analysis, Ultraviolet, Wavelengths, Emissions, Observations, Asymmetry, Hydrogen, Abundance, Hypotheses, Protons, Collisions, Ionosphere, Magnetic Effects, Anomalies, Particles, Atmosphere, T

Scientific paper

An analysis of the Voyager EUV spectra of the Jupiter sunlit equatorial emissions shows no evidence for a substantial dependence of atomic hydrogen abundance on magnetic longitude, required by earlier theories of the H Ly-alpha longitudinal asymmetry. An explanation for the H Ly-alpha bulge phenomenon is advanced in this work that conforms to the observations and does not require a strong asymmetry in atomic hydrogen abundance. It is proposed that the H Ly-alpha bulge is caused by a combination of proton collisional transfer of H(2s) atoms in the H(2p) state, and production through recombination of H2(+) and H3(+), in an asymmetric ionosphere. According to the present model a large fraction of the observed H Ly-alpha emission from the equatorial region is electron excited, at least at times of solar maximum.

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