Quasi-steady production of region 1 and region 2 field-aligned currents

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概要

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• Quasi-steady production of the hot plasma torus (HPT) in the magnetosphere and simultaneous generation of the region 1 and region 2 field-aligned currents (FACs) are numerically simulated for the case of southward interplanetary magnetic field. The magnetosphere-ionosphere coupling is treated in the two-dimensional electrostatic simulation model, and particularly incorporated are effects of the following processes : 1) nonadiabatic acceleration of ions incident on the tail plasma sheet (including particle acceleration at the magnetic reconnection), 2) plasma escape, along the open field lines, to the interplanetary space, and 3) anomalous cross-field diffusion of plasma particles. Under the condition that the open-closed boundary is distorted by the two-cell convection, the region 1 FAC (as well as the region 2 current) is steadily generated by a pressure-gradient mechanism. (Convection-distortion here means that the center of the circle fitted to the open-closed boundary (projected onto the ionospheric plane) is shifted antisunward so that this center is positioned at a latitude (on the midnight meridian) lower than that of the (averaged) ionospheric projection of the path of a magnetically drifting particle in the magnetosphere.) The simulations show that the HPT can be maintained as long as continual particle injection and energization take place, which implies that the primary energy source for the HPT and FACs is the particles nonadiabatically accelerated near the nightside injection boundary.

• 国立極地研究所の論文

著者

• Yamamoto Takashi

  University of Tsukuba

• Inoue Shoshi

  Aichi College of Technology

• Yamamoto T

  Kobe Univ.

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• Quasi-steady production of region 1 and region 2 field-aligned currents

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