PLASMA POPULATIONS IN THE MAGNETOSPHERE DURING THE PASSAGE OF MAGNETIC CLOUD ON JANUARY 10-11, 1997 - INTERBALL TAIL PROBE OBSERVATIONS/

The INTERBALL/Tail Probe observations of several unusual features of t he plasma populations in the Earth's magnetosphere during the passage of the magnetic cloud on January 6-11, 1997 are presented. Interaction of high-pressure pulses on leading and trailing edges of the cloud wi th the magnetosphere resulted in its strong compression and large-scal e motions of the geomagnetic tail. Several important consequences of t his interaction were: (1) observations of the magnetopause position 6R (E) nearer to the Earth than on average; (2) a huge increase in the ma gnetosheath plasma density and temperature; and (3) oscillation of mag netospheric tail structures past the satellite. These observations are discussed and compared with several models.