  Transient interaction of counter-streaming super-sonic plasma flows in dipole
magnetic dipole is studied in laboratory experiment. First quasi-stationary
flow is produced by teta-pinch and forms a magnetosphere around the magnetic
dipole while laser beams focused at the surface of the dipole cover launch
second explosive plasma expanding from inner dipole region outward. Laser
plasma is energetic enough to disrupt magnetic field and to sweep through the
background plasma for large distances. Probe measurements showed that far from
the initially formed magnetosphere laser plasma carries within itself a
magnetic field of the same direction but order of magnitude larger in value
than the vacuum dipole field at considered distances. Because no compression of
magnetic field at the front of laser plasma was observed, the realized
interaction is different from previous experiments and theoretical models of
laser plasma expansion into uniform magnetized background. It was deduced based
on the obtained data that laser plasma while expanding through inner
magnetosphere picks up a magnetized shell formed by background plasma and
carries it for large distances beyond previously existing magnetosphere.
