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A particle-in-cell code is used to examine contributions of the pickup ions(PIs) and the solar wind ions (SWs) to the cross shock electric field at thesupercritical, perpendicular shocks. The code treats the pickup ionsself-consistently as a third component. Herein, two different runs withrelative pickup ion density of 25% and 55% are presented in this paper. Presentpreliminary results show that: (1) in the low percentage (25%) pickup ion case,the shock front is nonstationary. During the evolution of this perpendicularshock, a nonstationary foot resulting from the reflected solar wind ions isformed in front of the old ramp, and its amplitude becomes larger and larger.At last, the nonstationary foot grows up into a new ramp and exceeds the oldone. Such a nonstationary process can be formed periodically. hen the new rampbegins to be formed in front of the old ramp, the Hall term mainly contributedby the solar wind ions becomes more and more important. The electric field Exis dominated by the Hall term when the new ramp exceeds the old one.Furthermore, an extended and stationary foot in pickup ion gyro-scale islocated upstream of the nonstationary/self-reforming region within the shockfront, and is always dominated by the Lorentz term contributed by the pickupions; (2) in the high percentage (55%) pickup ion case, the amplitude of thestationary foot is increased as expected. One striking point is that thenonstationary region of the shock front evidenced by the self-reformationdisappears. Instead, a stationary extended foot dominated by Lorentz termcontributed by the pickup ions, and a tationary ramp dominated by Hall termcontributed by the solar wind ions are clearly evidenced. The significance ofthe cross electric field on ion dynamics is also discussed.

Contributions to the cross shock electric field at supercritical perpendicular shocks: Impact of the pickup ions