منابع مشابه
Transient, small‐scale field‐aligned currents in the plasma sheet boundary layer during storm time substorms
We report on field-aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near the plasma sheet boundary layer (PSBL) during two major substorms on 23 June 2015. Small-scale field-aligned currents were found embedded in fluctuating PSBL flux tubes near the separatrix region. We resolve, for the first time, short-lived earthward (downward) intense field-aligned curre...
متن کاملAzimuthal plasma pressure gradient in quiet time plasma sheet
[1] We have investigated the quiet-time azimuthal plasma pressure gradient in the plasma sheet at a radial distance of 10 RE to 12 RE using two THEMIS spacecraft that were in overlapping orbits during the 2008 THEMIS tail season. The equatorial plasma pressure is estimated by using the insitu measurement of the plasma pressure and magnetic pressure based on pressure balance assumption. The resu...
متن کاملThe Plasma Sheet Source Groove
A test particle study of the ionospheric source of plasma in the EarthÕs plasma sheet has been performed, in an effort to understand an apparent inconsistency between the results of forward and backward (in time) test particle calculations. Most if not all forward calculations of polar wind ion outflows result in energetic plasma sheet ion populations; yet most if not all backward trajectory ca...
متن کاملEffect of storm-time plasma pressure on the magnetic field in the inner magnetosphere
[1] We investigate the effect of plasma pressure on the magnetic field in the near-Earth magnetosphere (2 to 6.5 RE) during the major magnetic storm of October 21–25, 2001. For this we obtain a time series of ‘‘snapshots’’, in each of which the magnetic forces are equilibrated by plasma pressure gradient forces. Each snapshot is computed using our 3-D equilibrium code, which is fed anisotropic ...
متن کاملHigh-beta plasma blobs in the morningside plasma sheet
Equator-S frequently encountered, i.e. on 30% of the orbits between 1 March and 17 April 1998, strong variations of the magnetic ®eld strength of typically 5±15-min duration outside about 9RE during the late-night/early-morning hours. Very high-plasma beta values were found, varying between 1 and 10 or more. Close conjunctions between Equator-S and Geotail revealed the spatial structure of thes...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2002
ISSN: 1432-0576
DOI: 10.5194/angeo-20-1737-2002