Particle injection though reconnection in the dayside magnetopause

Details Particle injection though reconnection in the dayside magnetopause Particle injection though reconnection in the dayside magnetopause

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21a0773n&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM21A-0773

Physics

2716 Energetic Particles, Precipitating, 2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2753 Numerical Modeling

Scientific paper

Present simulations based on a full 3-D particle electromagnetic code are performed in order to analyze the impact of a dawnward IMF field on the internal dynamics of the global 3-D magnetosphere. In the case that the northward IMF is switched gradually to dawnward, analysis of magnetic fields in the magnetopause confirms a signature of magnetic reconnection at both the dawnside and duskside. Arrival of dawnward IMF to the magnetopause creates a reconnection groove (where magnetic field is minimum) which causes particle entry into the deep region of the magnetosphere via field lines that go near the magnetopause. This deep connection is more fully recognized tailward of Earth. The flank weak-field region (so called "sash") joins onto the plasma sheet and the plasma sheet to form a geometrical feature called the cross-tail S that structurally integrates the magnetopause and the tail interior. This structure might contribute to direct entry between the magnetosheath to plasma sheet in the tail. Local heating is also evidenced in the plasma sheet which may be related to magnetosheath plasma. Present results are supported by two points: (i) similar sashs have been also evidenced in previous MHD simulations (White et al., 1998), and (ii) observations by Interball show the weak magnetic field regions where particle injections with higher temperature were found.

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