Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pcvb.book.....m&link_type=abstract
Unknown
Physics
Dmsp Satellites, Electron Precipitation, Planetary Boundary Layer, Polar Cusps, Ionospheric Currents, Magnetospheres, Signature Analysis, Solar Wind
Scientific paper
The DMSP satellite data was systematically surveyed during 3 months to determine the existence and frequency of occurrence of magnetospheric cusp regions with different plasma properties. The relationship of such observations with the orientation of the interplanetary magnetic field, with the solar wind parameters, and with geomagnetic activity was studied. Over 2000 cusp region crossings were analyzed. Only 2 percent of the cases show the precipitating electrons structured into 2 such distinct regions; they may be observed in either hemisphere. Such occurrences show a dependence on interplanetary magnetic field (IMF) orientations. The frequency of occurrence of the events also seems to depend on the values of solar wind parameters and IMF magnitude and reaches a maximum when quiet interplanetary conditions are met; it is also dependent on the aurora electrojet index. The energy levels of the two populations are always associated with different levels of flux.
Candidi Maurizio
Mastrantonio G.
Meng Ching I.
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