Spatial profile of magnetic field in the near-Earth plasma sheet prior to dipolarization by THEMIS: Feature of minimum B

Details Spatial profile of magnetic field in the near-Earth plasma sheet prior to dipolarization by THEMIS: Feature of minimum B Spatial profile of magnetic field in the near-Earth plasma sheet prior to dipolarization by THEMIS: Feature of minimum B

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3708106s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 8, CiteID L08106

Physics

5

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Substorms, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Magnetosphere: Inner

Scientific paper

We present THEMIS observations of the near-Earth plasma sheet that permit us to assess the geometrical structure of the magnetotail prior to dipolarization. Latitudinal profiles of the magnetic field were obtained by five spacecraft simultaneously around the magnetic equator at a distance of XGSM ˜ -10 RE in the premidnight for two events. It is found that the strength of normal magnetic field Bz was increased with a distance from the magnetic equator, which differs considerably from the standard magnetic field model. Instead, the observation can be explained by a magnetic field model that has a minimum in the equatorial field strength (minimum B), as required from the force-balanced magnetotail model with steady earthward convection. Moreover, the analyses showed that the feature of minimum B sustained continuously for ˜20 min before dipolarization onsets.

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