ISEE 1 and 2 observations of Birkeland currents in the earth's inner magnetosphere

Details ISEE 1 and 2 observations of Birkeland currents in the earth's inner magnetosphere ISEE 1 and 2 observations of Birkeland currents in the earth's inner magnetosphere

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.6945k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, June 1, 1986, p. 6945-6958.

Physics

19

Atmospheric Electricity, Birkeland Currents, Earth Magnetosphere, International Sun Earth Explorers, Ionospheric Currents, Magnetic Signatures, Current Density, Current Sheets, Energetic Particles, Time Series Analysis

Scientific paper

Signatures of Birkeland currents in the earth's inner magnetosphere observed from the ISEE 1 and 2 spacecraft during November 1977-December 1978 at distances ranging from 2.4-7.0 earth radii are examined. The data reveal that most of the currents were detected during outbound rather than inbound passes. Large-scale current structures were identified as parts of the region 1 and 2 current systems in 27 percent of the spacecraft outbound passes; no distinguishable region 1 or 2 currents were detected in 19 percent of the outbound passes; and in 54 percent of the passes multiple current structures and ambiguous magnetic signatures were observed. The properties of Birkeland current structures observed on January 31, 1978, February 28, 1978, March 15, 1978, June 21, 1978, and June 25, 1978 are described. It is observed that the current sheet thicknesses range from 519-18,279 km; sheet current density ranges from 13-150 mA/m; and the volume current density ranges from 1.7-128 nA/sq m.

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