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Transient interaction of magnetic dipole with plasma flow carrying southwardmagnetic field is studied in laboratory experiment. The flow with transversefrozen-in field is generated by means of laser-produced plasma cross-fieldexpansion into background plasma which fills vacuum chamber along externallyapplied magnetic field prior to interaction. Probe measurements showed that atrealized plasma parameters effective collisionless Larmor coupling takes placeresulting in formation of strong compressive perturbation which propagates inbackground with super-Alfvenic velocity and generates in laboratory frametransverse electric field comparable in value to expected induction one.Compression pulse with southward field after short propagation interacts withdipole and creates well defined magnetosphere. Comparison of magnetospherescreated by laser-produced plasma expanding in vacuum field and in magnetizedbackground revealed fundamental differences in structure and behavior ofelectric potential in plasma. In presence of frozen-in southward field direct{\guillemotleft}sub-solar{\guillemotright} penetration of outside electricpotential deep inside of magnetosphere was observed taking place with velocityclose to upstream Alfven speed.

Laboratory model of magnetosphere created by strong plasma perturbation with frozen-in magnetic field