Turbulent transport and heating in the auroral plasma of the topside ionosphere |
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| Authors: | JA Ionson RSB Ong EG Fontheim |
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| Institution: | Laboratory for Astronomy and Solar Physics, NASA/Goddard Space Flight Center, Greenbelt, MD, 20771, U.S.A.;Space Physics Research Laboratory, Department of Atmospheric and Oceanic Science, The University of Michigan, Ann Arbor, Michigan 48109, U.S.A. |
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| Abstract: | Using plasma parameters from a typical stormtime ionospheric energy balance model, we have investigated the effects of plasma turbulence on the auroral magnetoplasma. The turbulence is assumed to be comprised of electrostatic ion cyclotron waves. These waves have been driven to a nonthermal level by a geomagnetic field-aligned, current-driven instability. The evolution of this instability is shown to proceed in two stages and indicates an anomalous increase in field-aligned electrical resistivity and cross-field ion thermal conductivity as well as a decrease in electron thermal conductivity along the geomagnetic field. In addition, this turbulence heats ions perpendicular to the geomagnetic field and hence leads to a significant ion temperature anisotropy. |
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