The ionosphere of Uranus - A myriad of possibilities

Details The ionosphere of Uranus - A myriad of possibilities The ionosphere of Uranus - A myriad of possibilities

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13....6c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Jan. 1986, p. 6-9.

Physics

11

Atmospheric Models, Planetary Ionospheres, Uranus Atmosphere, Hydrogen, Ionospheric Electron Density, Lyman Spectra, Methane, Uranus, Ionosphere, Models, Exosphere, Temperature, Methane, Water, Electrons, Precipitation, Composition, Structure, Ions, Concentration, Altitude, Hyrogen, Emissions, Lyman-Alpha Radiation, Polar Regions, Energy, Flux, Source, Scattering, Absorption

Scientific paper

A one-dimensional model has been used to study the effects of exospheric temperature, methane and water influx, ionospheric outflow, and electron precipitation on the composition and structure of the ionosphere of Uranus. Peak ion concentrations range from 1000 to 1 million per cu cm with a wide variation in peak altitude, which depends strongly on the exospheric temperature. In all the cases considered, H(+) is the major ion in the topside ionosphere. At altitudes near or below the peak, H3(+) and CH5(+) can dominate, depending on the magnitude of CH4 and H2O influx. Atomic hydrogen column depths above the methane absorbing layer exceed 10 to the 17th per sq cm and can produce large (400 R) emissions of resonantly scattered Lyman-alpha. In the sunlit polar cap, electron precipitation with energy fluxes of 0.6 to 1.0 erg/sq cm s results in direct production of Lyman-alpha emissions that exceed 1 kR.

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