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DTSTAMP:20260609T181648Z
SUMMARY:2012 Fall Seminar SeriesEscape of Neutral Gas and Plasma from the Earth’s Upper Atmosphere Dr. Robert W. Schunk
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:=0D=0A=
At high latitudes, the Earth’s upper atmosphere is subjected to electric fields, precipitating particles,=0D=0A=
currents, and both plasma (O+, H+) and neutral (O, H) outflows. As the plasma drifts horizontally=0D=0A=
through the different high-latitude regions in response to the electric fields, the ionosphere-atmosphere=0D=0A=
system and particle outflows become spatially structured and highly time-dependent.=0D=0A=
There are stationary and propagating plasma jets, large-scale H+ blowouts, counter-streaming O+=0D=0A=
and H+ vertical flows, bite-outs in the outflow with altitude, plasma outflow pulsations, and during=0D=0A=
storms O+ can be the dominant ion to altitudes as high as several Earth radii in the polar region.=0D=0A=
The ion outflows interact in a complex way with acceleration mechanisms that operate at high=0D=0A=
altitudes over the polar region, including mechanisms associated with escaping photoelectrons,=0D=0A=
hot precipitating electrons and ions, electromagnetic and electrostatic wave turbulence, centrifugal=0D=0A=
acceleration, and anomalous resistivity associated with field-aligned currents. These acceleration=0D=0A=
mechanisms can result in non-Maxwellian velocity distributions, including ion beams, conics, double-humped,=0D=0A=
bi-Maxwellian, toroidal and others. Some of the escaping ions can charge exchange with=0D=0A=
the background neutrals (thermal and hot exospheric neutrals), which leads to an outflow of neutral=0D=0A=
particles. An overview of the relevant escape processes will be presented.=0D=0A=
=0D=0A=
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LOCATION:Baylor Science Building, Room: E 231
DTSTART;TZID=US_Central:20121116T133000
DTEND;TZID=US_Central:20121116T150000
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