Plasma Pressure under Magnetopause on the Dusk Flank in the Equatorial Plane for Large Negative ХGSM
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The crossings of the magnetopause and low-latitude boundary layer by the THEMIS-B satellite in the spring of 2008 on the dusk flank under large negative XGSM (from –17RE to –19RE) are studied. The parameters of plasma and magnetic field are analyzed from the data of ESA and MGF instruments. The changes in the total pressure, magnetic field pressure, and plasma pressure component during the transition from the magnetosheath to the plasma sheet (PS) are analyzed. The values of plasma pressures under the magnetopause at the edge of the PS for the considered events are determined. The applicability of the obtained results to the determination of the position of the boundary between the tail current and the ring current is discussed.
We are grateful to V. Angelopoulos, the THEMIS project team, and the participants of the NASA project no. NAS5-02099 for access to and preparation of the THEMIS project data. In particular, we thank C.W. Carlson and J.P. McFadden for the ESA instrument data, K.-H. Glassmeier, U. Auster, and W. Baumjohann for the FGM instrument data prepared under the guidance of the Technical University of Braunschweig, with the financial support of the German Federal Ministry of Economics and Technology, and with the assistance of the German Aerospace Center (DLR) within the project no. 50 OC 0302. This work was supported by the Russian Foundation for Basic Research, project no. 18-05-00362.
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