The Uranian corona as a charge exchange cascade of plasma sheet protons

Details The Uranian corona as a charge exchange cascade of plasma sheet protons The Uranian corona as a charge exchange cascade of plasma sheet protons

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3999h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3999-4011.

Physics

5

Charge Exchange, Magnetospheric Proton Density, Planetary Magnetospheres, Plasma Layers, Uranus Atmosphere, Convection Currents, High Temperature Plasmas, Particle Interactions, Uranus, Coronas, Plasma Sheet, Protons, Charged Particles, Magnetosphere, Model, Convection, Collisions, Hydrogen, Neutral Particles, Ionization, Atmosphere, Plasma, Density, Temperature, Comparison, Flux, Parameters, Spacecraft Observations, Voyager 2 Mission, Uvs Instrument, Heat, Origin, Source, Thermosphere, Drift, Trajectory, C

Scientific paper

The paper uses models of magnetic convection and interparticle interactions to examine the collisional interactions between atmospheric neutral hydrogen and magnetospheric charged particles observed by Voyager to be convecting through the Uranian magnetosphere. The e(-)-H collisional ionization process, continually reenergized by compressional heating of the electrons as they drift toward Uranus, produces a cascade of new plasma. This process has been suggested elsewhere as the source of the warm (10 eV at L = 5) plasma and is found in the present study to continue in a cascade to even cooler and more abundant plasma. This newly created plasma consists almost entirely of electrons and protons because He and H2 are nearly absent from the uppermost layers of the atmosphere. If this plasma crosses the dayside magnetopause and mixes with magnetopause boundary layers such as the plasma mantle, there to be swept back along the magnetotail, reincorporated into the magnetotail by the same processes postulated for solar wind plasma entry, and reenergized in the magnetotail current sheet, it would constitute an important source for the hot plasma observed by Voyager.

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