Physics – Plasma Physics
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1419j&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 11, p. 1419-1422
Physics
Plasma Physics
21
Ionosphere: Current Systems, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Numerical Modeling, Space Plasma Physics: Numerical Simulation Studies
Scientific paper
We have studied the closure path of Region-1 field-aligned current system in our global MHD simulation and found some interesting results. After leaving the ionosphere on the eveningside the current deviates from the field-aligned direction rather early and bends towards the Sun. After passing through the velocity shear region near the magnetopause, which is a generator region, it climbs up along the magnetopause, being more or less field-aligned. Because of this it again bends sunward. When approaching the noon-midnight meridian plane (Y=0 plane in GSM coordinates), however, the current becomes more perpendicular to the magnetic field. It passes through the Y=0 plane at about X=2+/-1, Z=11+/-1. On the morningside the closure path is a mirror reflection of that on the evening side. Thus the closure path seems to reside more on the dayside than perhaps usually thought. We give a simple physical explanation for the dayside bending, which is based on the MHD pressure balance equation.
Janhunen Pekka
Koskinen Hannu E. J.
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