The Dawn-dusk Asymmetry of the Dayside Convection Reversal Location on High Geomagnetic Disturbed Days (Combination of Stare, Triad and AE-C)

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.