Signatures of the high-altitude polar cusp and dayside auroral regions as seen by the Viking Electric Field Experiment

Details Signatures of the high-altitude polar cusp and dayside auroral regions as seen by the Viking Electric Field Experiment Signatures of the high-altitude polar cusp and dayside auroral regions as seen by the Viking Electric Field Experiment

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5767m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5767-5780. Research supported by the Swedish Board fo

Physics

41

Auroral Zones, Electric Fields, Polar Cusps, Satellite Observation, Space Plasmas, Planetary Magnetic Fields, Plasma Density, Spacecraft Charging, Spatial Distribution, Temporal Distribution, Viking Spacecraft

Scientific paper

Electric-field and satellite-potential (which is a rough measure of plasma density) observations along 42 Viking orbits in the high-altitude (2 earth radii) polar cusp and dayside auroral region have been examined. A useful straightforward way to identify the polar cusp from the satellite potential is demonstrated, the results being in excellent agreement with those based on particle data. Within the cusp the plasma density usually reaches a maximum, and it is typically very homogeneous, in contrast to the irregular and lower density in the cleft and dayside auroral regions. The maxima in the plasma density are sometimes anticorrelated with the magnetic field strength, indicating a diamagnetic effect. The entire cusp and dayside auroral regions are characterized by irregular and burstlike electric fields, comprising field reversals on various scales (up to 3 min or 500 km), the larger scales, however, being rare in the cusp.

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