The Dawn-dusk Asymmetry of the Dayside Convection Reversal Location on High Geomagnetic Disturbed Days (Combination of Stare, Triad and AE-C)
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摘要: 本文通过STARE观测的晨不连续性及其与TRIAD观测的场向电流分界区、AE-C卫星观测的电场转向区位置的比较,提出了在高扰日向阳面对流电场转向区位置存在着晨不对称性——晨半面所处纬度低于昏半面.该现象间接说明向阳面磁层边界层也存在某种不对称性.并在观测基础上对可造成该不对称性的物理因子进行了探讨,认为行星际磁场螺线结构对重连区位置的影响及其产生的激波结构的晨昏不对称性很可能与本文中讨论的现象有一定联系.Abstract: A combination of convection velocity data from the STARE radar and Atmosphere Explorer C and Field-aligned current data from TRIAD are examined tinder high geomagnetic activity conditions. It is found that the dawnside convection reversal and the boundary of the two field-aligned currents are located at lower invariant latitudes than are the duskside ones. The asymmetry at ionospheric altitudes demonstrates that some kinds of asymmetry in transfer processes of mass, momentum and energy of solar wind particles are also developed in dayside magnetosphere under high magnetic activity condition. It is suggested that this asymmetry derives from the "Garden Hose" angle of the interplanetary magnetic field. It seems that the dawn-dusk asymmetry of the shock structures in Earth's bow shock is related to the phenomena discussed here. Other possibilities are also discussed.
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