Observations of field-aligned currents, particles, and plasma drift in the polar cusps near solstice

Details Observations of field-aligned currents, particles, and plasma drift in the polar cusps near solstice Observations of field-aligned currents, particles, and plasma drift in the polar cusps near solstice

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.5131b&link_type=abstract

Journal of Geophysical Research, vol. 87, July 1, 1982, p. 5131-5139. NASA-NSF-Navy-supported research.

Computer Science

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12

Birkeland Currents, Energetic Particles, Field Aligned Currents, Ionospheric Currents, Plasma Drift, Polar Cusps, Polar Regions, Satellite Sounding, Explorer 51 Satellite, Magnetic Disturbances, Magnetometers, Solstices, Southern Hemisphere

Scientific paper

Magnetic perturbations observed by the TRIAD magnetometer within two hours of an AE-C spacecraft pass provide field-aligned current data, from the same local time in the northern hemisphere, for a study of the polar cusp. The AE-C spinning mode has allowed the use of the Z-axis magnetometer for Birkeland current observations, in conjunction with particle and drift measurements. The average B(z) were found to be 1.9 nT and -1.1 nT during the first two hourly intervals on January 15, 1977. Measurements from the low energy electron experiment revealed intense fluxes of soft, cusp-like 100 eV Maxwellian electrons throughout the prenoon polar cap. The upward directed current can be identified as the dominant cusp current appropriate for B(y) values lower than zero, while the downward directed current, which has the appropriate sign of a dayside region 1 current, is observed to lie entirely within a westerly, antisunward-convecting plasma.

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