Solar wind particle trajectories in the magnetopause

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Magnetopause, Particle Trajectories, Solar Wind, Space Plasmas, Collisionless Plasmas, Equatorial Atmosphere, Nonequilibrium Conditions, Solar Electrons, Solar Protons

Scientific paper

Calculations and derivations in this paper are made under the assumption that solar wind stream is collimated, has no magnetic field, no thermal motions and no collisions, and impinges onto a plasma-free magnetosphere via a Parker magnetopause layer in which, as defined, the electric field is completely shortcircuited by the magnetic force lines rooting in the conductive ionosphere. Self-consistent results for the trajectories of solar protons and electrons, and the magnetic field in the magnetopause, are obtained for the subsolar area and for the dusk side of the equatorial region of the magnetopause. The trajectories are of V-shape for protons and alpha-shape for electrons in the dusk side, but both are degenerated to U-shape at the sub-solar point. When the incidence angle is greater than a critical value 1.89 deg, no self-consistent particle trajectories and magnetic field can be found on the dawn side. This suggests that a nonequilibrium state exists in the dawn side of the magnetopause. Thus, the dawn-side magnetopause is expected to be more unstable, or turbulent, than the other side.

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