Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm32b..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM32B-01
Physics
[2475] Ionosphere / Polar Cap Ionosphere, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling, [2776] Magnetospheric Physics / Polar Cap Phenomena
Scientific paper
At high latitudes, the Thermosphere-Ionosphere-Magnetosphere system is coupled via electric fields, precipitating particles, currents, and ionospheric outflows. As the ions drift horizontally through the different high-latitude regions in response to magnetosphere electric fields, the ionosphere-thermosphere system and ion outflows become spatially structured and highly time-dependent. There are stationary and propagating polar wind jets, holes in the polar wind, large-scale H+ blowouts, counter-streaming O+ and H+ vertical flows, bite-outs in the outflow with altitude, polar wind pulsations, and during storms O+ can be the dominant ion to altitudes as high as several Earth radii in the polar region. The ion outflows interact in a complex way with acceleration mechanisms that operate at high altitudes over the polar region, including mechanisms associated with escaping photoelectrons, hot magnetosphere electrons and ions, electromagnetic and electrostatic wave turbulence, centrifugal acceleration, and anomalous resistively associated with field-aligned currents. These acceleration mechanisms can result in ion beams, conics and other non-Maxwellian velocity distributions. Some of the escaping ions can charge exchange with the background neutrals (thermal and hot exospheric neutrals), which leads to a neutral polar wind. These and other processes that affect ion/neutral outflow will be discussed.
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