Observations of polar rain at low and high altitudes

Details Observations of polar rain at low and high altitudes Observations of polar rain at low and high altitudes

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213547b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13547-13560. DOE-sponsored research.

Physics

25

Electron Precipitation, High Altitude, Interplanetary Magnetic Fields, Low Altitude, Polar Caps, Polar Regions, Solar Wind, Dmsp Satellites, Energy Spectra, Flux (Rate)

Scientific paper

Data from the low-altitude DMSP spacecraft were used to compare polar rain electron intensities, energy spectra, and time variations at low altitudes with concurrent bidirectional electron properties in the magnetotail measured by ISEE 3. The DMSP-measured polar rain phase space densities near the polar cap agreed well with the field-aligned magnetotail lobe electron phase space densities above about 200 eV. Below 100-200 eV, a thermal electron population was observed (by ISEE) in the distant tail which is absent at the DMSP altitudes. The results suggest that the suprathermal tail lobe electrons can move freely along field lines to form polar rain, whereas the thermal electrons are bound to the tailward flowing lobe ion population far down the tail and thus cannot reach the polar cap regions.

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