Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..763l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 763-766.
Physics
22
Io, Magnetohydrodynamic Flow, Mass Flow Factors, Plasma Temperature, Flow Velocity, Gas Ionization, Neutral Gases, Space Plasmas, Toroidal Plasmas
Scientific paper
How the addition of ions at rest (mass loading) affects the temperature of a flowing plasma in a MHD approximation is investigated, using analytic theory and time dependent, three-dimensional MHD simulations of plasma flow past Io. The MHD equations show that the temperature can increase or decrease relative to the background, depending on the local sonic Mach number M(S), of the flow. For flows with M(S) of greater than sq rt 9/5 (when gamma = 5/3), mass loading increases the plasma temperature. However, the simulations show a nonlinear response to the addition of mass. If the mass loading rate is large enough, the temperature increase may be smaller than expected, or the temperature may actually decrease, because a large mass loading rate slows the flow and decreases the thermal energy of the newly created plasma.
Galland Kivelson Margaret
Linker Jon A.
Walker Raymond J.
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