Structure of the neutral sheet in the distant tail (x = -210 R(sub e)) in geomagnetically quiet times

Details Structure of the neutral sheet in the distant tail (x = -210 R(sub e)) in geomagnetically quiet times Structure of the neutral sheet in the distant tail (x = -210 R(sub e)) in geomagnetically quiet times

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2951n&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2951-2954

Physics

14

Geomagnetic Tail, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetic Field Reconnection, Neutral Sheets, Planetary Magnetic Fields, Plasma Drift, Satellite Observation, Space Plasmas, Electric Fields, Flow Velocity, Geophysical Satellites, Magnetic Flux, Magnetohydrodynamic Flow, Mathematical Models, Statistical Analysis

Scientific paper

We have analyzed the magnetic and the electric field data of GEOTAIL obtained in the neutral sheet of the distant tail at absolute value of x = 210 R(sub e) when Kp was 0 or 1. In the distant neutral sheet, B(sub y) is strongly dependent on interplanetary magnetic field (IMF) B(sub y) and when averaged in each IMF sector B(sub y) is much larger than B(sub z). The average B(sub z) is a few times of 0.1 nT or less so that the precise value is critically dependent on the offset determination with an accuracy better than 0.1 nT. The drift velocity is directed anti-earthward and 300 to 400 km/s. A modified cusp reconnection model is proposed in which the tail field lines that reconnect with IMF on the surface of the tail are not open but traverse the neutral sheet. Magnetic torque is transmitted from the reconnection site along these tail field lines and produce the IMF-dependent B(sub y) component in the neutral sheet.

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