The evolution of field-aligned currents as a function of substorm phase

Details The evolution of field-aligned currents as a function of substorm phase The evolution of field-aligned currents as a function of substorm phase

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615801c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,801-15,810.

Physics

8

Field Aligned Currents, International Sun Earth Explorers, Ionospheric Currents, Magnetic Storms, Magnetosphere-Ionosphere Coupling, Current Sheets, Geomagnetism, Magnetic Field Reconnection, Night Sky

Scientific paper

The average ionospheric extrapolated characteristics and properties of region 1 and 2 currents are determined as a function of the substorm phase via an examination of ISEE 1 and 2 measurements of magnetic changes across nightside field-aligned currents at middle altitudes in the inner magnetosphere. The properties of these currents under consideration include current intensity, density, layer width, and velocity, and they are consistent with earlier studies at lower altitudes. During a substorm, region 1 current intensity ranges from 0.4 to 0.6 A/m and peaks during the expansion phase. Region 2 intensity varies from 0.15 to 0.35 A/m and reaches a maximum during recovery. The density of region 2 currents remains essentially steady at 1.4 microamp/sq m, while region 1 decreases from 5 to 1.3 microamp/sq m. The width of these current sheets throughout a substorm remains in the range from 100 to 500 km. It is concluded that substorms play a major role in the generation of the nightside region 1 and 2 currents detected by the ISEE spacecraft.

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