Atomic hydrogen corona of Uranus

Details Atomic hydrogen corona of Uranus Atomic hydrogen corona of Uranus

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10110877h&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A5, p. 10877-10886

Physics

5

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Magnetospheric Physics: Planetary Magnetospheres, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics

Scientific paper

We have analyzed Voyager 2 ultraviolet spectrometer observations of the H Lyman α emission from the atomic hydrogen corona of Uranus. The resulting estimated hydrogen density distribution has a radial profile ~1/r2. This distribution implies a weakly bound or escaping population of hot (>2 eV) hydrogen not thermalized with the 0.07 eV thermosphere/exosphere. The hot H density is enhanced on the sunward side of Uranus, with the maximum weakly associated with the dayside magnetic pole. The source of this hot hydrogen is presumably near the position we have found for the density maximum. Therefore we suggest that this source of hot H atoms may be associated either with electroglow or else with the dayside aurora.

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