Polar cap boundary and structure of dayside cusp as determined by ion precipitation

Details Polar cap boundary and structure of dayside cusp as determined by ion precipitation Polar cap boundary and structure of dayside cusp as determined by ion precipitation

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991esasp.330...31t&link_type=abstract

In ESA, Cluster Dayside Polar Cusp p 31-34 (SEE N92-26294 17-46)

Mathematics

Logic

Atmospheric Boundary Layer, Earth Ionosphere, Ion Density (Concentration), Particle Precipitation, Polar Caps, Polar Cusps, Arctic Regions, Auroral Zones, Daytime, Dmsp Satellites, Earth Magnetosphere, Interplanetary Magnetic Fields

Scientific paper

The results of particle measurements on board DMSP (Defense Meteorological Satellite Program) F6 and F7 spacecraft show that the ion precipitation features in the auroral oval and in the polar cap are systematically diverse: the ion precipitation in the oval is of a smoothed character, whereas that in the polar cap is of a patchy type. The boundary between these two types of ion precipitation can usually be detected by a quick fall in the ion total number flux below some definite level. The polar cap identified in such a way has a shape of a roughly Sun aligned ellipse when IMF (Interplanetary Magnetic Field) is northward. Under the influence of the azimuthal IMF the northern polar cap is shifted toward the dusk (dawn) when B sub y is greater than 0 (B sub y is less than 0). In the southern polar cap the effect is opposite. The following structural zones in the dayside oval can be separated using the ion data: cusp, cusp core (near the noon meridian), poleward edge of the cusp, equatorward edge of the cusp.

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