Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29i..41i&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 9, pp. 41-1, CiteID 1327, DOI 10.1029/2001GL013723
Physics
Ionosphere: Polar Cap Ionosphere, Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Polar Cap Phenomena
Scientific paper
The plasma density in the polar cap ionosphere is generally low (<103 cm-3 above 3000 km), mainly because of plasma escape from the ionosphere along open magnetic-field lines. The Akebono satellite occasionally encounters regions of unusually high plasma density (>=103 cm-3) above 4000 km altitude, in which the thermal plasma exhibits a distinctively low electron temperature (<3000 K) and low parallel ion drift velocity (<=1 km/s). Such events are almost always observed on the dusk side. The occurrence of low electron temperature and ion drift velocity appears to suggest the antisunward convection of high-density plasma into the polar cap, and the decrease in electron temperature due to the disruption of field-aligned heat flux in the high-altitude polar cap.
Abe Takumi
Ichikawa Yoh-ichi
Yau Andrew W.
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