Electron temperature and density at high latitude

Details Electron temperature and density at high latitude Electron temperature and density at high latitude

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10314837k&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A7, p. 14837-14846

Physics

35

Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Polar Cap Phenomena, Ionosphere: Topside Ionosphere

Scientific paper

The background electron temperature and density at altitudes between 1000 and 8000 km at invariant latitudes >60° have been determined from swept Langmuir probe measurements from the S3-3 satellite. These plasma parameters are determined by fitting the measured probe current-voltage relation to the expected theoretical response. Statistically acceptable fits are found for ~20% of all measurements and do not include measurements within the auroral density cavity. The results indicate that the density varies as an inverse power law with increasing altitude which has a typical value of 10 cm-3 at 8000 km in altitude. The electron temperature shows a slight increase with altitude but is <5 eV for almost all measurements. These results suggest that the background plasma outside of auroral density cavities on high-latitude field lines below 8000 km is dominated by cold plasma of ionospheric origin which is at least an order of magnitude more dense than hotter magnetospheric components.

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