Seasonal variations along auroral field lines: Measurements from the Polar spacecraft

Details Seasonal variations along auroral field lines: Measurements from the Polar spacecraft Seasonal variations along auroral field lines: Measurements from the Polar spacecraft

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30f..77j&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 6, pp. 77-1, CiteID 1344, DOI 10.1029/2002GL015866

Physics

6

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Electric Fields (2411)

Scientific paper

Measurements from the Polar electric field instrument are used to study large electric fields and the ambient plasma density as a function of altitude (1.8-6.0 RE geocentric). Results from the premidnight sector (1800-2400 MLT) along auroral field lines show roughly a fourfold increase in the occurrence of small scale size, large amplitude electric fields (>100 mV m-1) at altitudes from 1.9 to 2.5 RE for dark compared to sunlit ionospheric conditions. Density values inferred from spacecraft potential measurements show these electric fields to be correlated with low plasma densities (0.2 to 3.0 cm-3). An increase in the average plasma density from 10 to 60 cm-3 is also observed for sunlit compared to dark conditions for the same altitude range. In addition, the distribution of density measurements from 1.9 to 2.2 RE also show evidence for an increase in cold ionospheric plasma (from ~30 to 60 cm-3) for sunlit compared to dark ionospheric conditions.

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