Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21a0770z&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM21A-0770
Physics
2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
Thin current sheets (TCS) are found in the geomagnetotail at 7-18 Re from the Earth prior to and during magnetospheric substorms. TCS may be (a) as thin as the thermal ion gyroradius in the field outside the sheet, (b) embedded inside a thicker plasma sheet, and (c) strongly inhomogeneous along the Earth-Sun axis. While the features (a) and (b) can be captured by 1D forced current sheet models, (c) requires their considerable generalization to take explicitly into account the build-up of the magnetic pressure in the earthward direction. We describe the corresponding family of TCS models, which captures all the features (a)-(c) by using a new set of invariants of motion in the ion distribution, namely, the total energy, the dawn-dusk component of the canonical momentum, and the sheet invariant of the quasi-adiabatic motion. The distinctive features of the new class of TCS models, including the analogue of Walen relation are discussed. It is shown in particular that the new TCS models can provide much steeper pressure profiles along the Earth-Sun axis compared to conventional isotropic models.
Sharma Aashish
Sitnov Mikhail I.
Zelenyi Lev
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