Morphology of the polar rain

Details Morphology of the polar rain Morphology of the polar rain

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9785g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9785-9800.

Physics

50

Electron Precipitation, Flux Quantization, Polar Caps, Dmsp Satellites, Interplanetary Magnetic Fields, Satellite Observation, Space Plasmas, Statistical Analysis

Scientific paper

The statistical properties of polar rain are reexamined using precipitating electron measurements from the DMSP/F2 satellite. The large-scale variations across the two horizontal dimensions of the cap are identified as a function of auroral activity, IMF conditions, and season. A more precise evaluation is given of the contribution that precipitating electrons in the polar rain make to the energy and mass budget of the magnetosphere. The results show that the polar rain fluxes are highest on the dayside of the cap, and that the average polar rain number and energy flux increases with magnetic activity, as does the size of the polar rain precipitation region. In all cases the average precipitation is much weaker than in the auroral oval. The polar rain fluxes are higher in the north (south) pole for away (toward) sectors in which B(y) is positive (negative). The average energy and number flux of the polar rain vary together in a consistent manner.

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