Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm22a..02s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM22A-02
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, both light and heavy ions can escape from the topside ionosphere along diverging geomagnetic field lines. In addition to this vertical flow, the escaping ions drift horizontally across the polar region due to magnetospheric electric fields, moving into and out of sunlight, the dayside cusp, polar cap, and nocturnal oval. The up-flowing ions also interact in a complex way with acceleration mechanisms that operate at high altitudes over the polar region, including mechanisms associated with escaping photoelectrons, hot magnetospheric electrons, electromagnetic wave turbulence, centrifugal acceleration, and anomalous resistivity associated with field-aligned currents. Some of the escaping ions can charge exchange with the background neutrals (thermal and hot exospheric neutrals), which leads to a neutral polar wind. During magnetic storms and substorms, the ion and neutral outflows are spatially structured and highly time-dependent. There are stationary and propagating polar wind jets, holes in the polar wind, counter-streaming O+ and H+ vertical flows, bite-outs in the outflow with altitude, ion/neutral polar wind pulsations, and O+ can be the dominant ion to altitudes as high as several Earth radii over the bulk of the polar region. The ion outflow looks like a flicking campfire with the brightest fire around the edges (the oval). These and other processes that affect ionosphere-magnetosphere plasma redistribution will be discussed.
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