Physics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10625919i&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A11, p. 25919-25928
Physics
4
Magnetospheric Physics: Current Systems, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Magnetotail
Scientific paper
Analysis of Geotail magnetic data enables us to reveal the antisunward electric current flowing along the tail axis. To our knowledge, observation of this current has not been reported yet. Distributions of the magnetic field and electric current density (along with their dependencies on the tilt angle of the Earth's dipole and components of the interplanetary magnetic field) have been derived directly from Geotail data, without any ad hoc assumptions. Analysis of the electric current density distribution shows that, in addition to currents associated with the geomagnetic tail flaring, there is a current (tentatively identified as the Hall current) flowing antisunward along the tail axis. The total strength of this current is of the order of 1 MA. It closes through the midnight sector of the auroral zone resulting in field-aligned currents in the region of the Harang discontinuity.
Ershkovich A. I.
Israelevich Peter L.
Tsyganenko Nikolai A.
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