Characterization of the IMF By-dependent field-aligned currents in the cleft region based on DE 2 observations

Details Characterization of the IMF By-dependent field-aligned currents in the cleft region based on DE 2 observations Characterization of the IMF By-dependent field-aligned currents in the cleft region based on DE 2 observations

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1393t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1393-1407.

Physics

62

Field Aligned Currents, Interplanetary Magnetic Fields, Magnetopause, Plasma Diagnostics, Satellite Observation, Dynamics Explorer 2 Satellite, Earth Ionosphere, Electric Fields

Scientific paper

The magnetic field and plasma data from 47 passes of DE-2 are used to study the IMF By-dependent distribution of field-aligned currents in the cleft region. It is proposed that the low-latitude cleft current (LCC) region is not an extension of the region 1 or region 2 current system and that a pair of LCCs and high-latitude cleft currents (HCCs) constitutes the cleft field-aligned current regime. The proposed pair of cleft field-aligned currents is explained with a qualitative model in which this pair of currents is generated on open field lines that have just been reconnected on the dayside magnetopause. The electric fields are transmitted along the field lines to the ionosphere, creating a poleward electric field and a pair of field-aligned currents when By is positive; the pair of field-aligned currents consists of a downward current at lower latitudes and an upward current at higher latitudes. In the By negative case, the model explains the reversal of the field-aligned current direction in the LCC and HCC regions.

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