Abstract

Abstract An important role of velocity shear in producing transient magnetic reconnection in the magneto- pause boundary layer region is supposed. Two kinds of velocity shears may be there in the magnetopause boundary layer: the velocity shear of field-aligned flow occuring at the high latitude boundary layer region in the dayside magnetopause outside the subsolar point region or cusp region; and the velocity shear of transverse flow near the subpolar point region. The influence of velocity shear on magnetic reconnection processes has been investigated systematically in the magnetopause boundary layer, including: vortex induced reconnection(VIR), single X line bursty reconnection(SBXR), transverse shear flow rushed reconnection, stochastic reconnection, and local transient reconnection in the high latitude boundary layer under different IMF conditions. Finally, the plamoid events in the magnetospheric boundary layer are discussed.

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