Physics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.2643n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, April 1, 1988, p. 2643-2648.
Physics
33
Particle Precipitation, Polar Cusps, Solstices, Electron Precipitation, Interplanetary Magnetic Fields, Northern Hemisphere, Southern Hemisphere, Summer, Winter
Scientific paper
DMSP F7 satellite observations of electron and ion polar-cusp precipitation in the summer and winter hemispheres on four successive solstices (1983-1985) are analyzed statistically. The data reduction and processing procedures are described in detail, and the results are presented graphically. The precipitating ion and electron energy fluxes at the summer solstices are found to be 61 + or - 11 percent and 51 + or - 5 percent (respectively) greater than in the winter (although with lower average energy per particle), independent of the IMF direction. The apparent difficulty with which lower-energy ions enter the winter cusp is attributed to the greater distance between the winter cusp and the subsolar point, and the hemispherical assymetry in particle precipitation is shown to be consistent with a simple theoretical model in which the cusp lies on open magnetic-field lines.
Meng Ching I.
Newell Patrick T.
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