SMALL-SCALE OBSERVATION OF MAGNETOPAUSE MOTION - PRELIMINARY-RESULTS OF THE INTERBALL PROJECT

Two satellites of the INTERBALL project were launched on 3 August 1995 . The main goals of the present paper are (1) to give a brief informat ion about the VDP plasma device onboard the INTERBALL-1 satellite, (2) to present the Faradays cup data taken in different magnetospheric re gions and (3) to exposure first results of the two satellite measureme nts of the magnetopause motion. The presented data illustrate magnetop ause crossings as seen by two satellites when separated by about simil ar to 1000 km. This separation combined with the Faraday's cup time re solution allows to estimate the velocity of the magnetopause and to re construct a possible structure of the boundary. Simultaneous measureme nt of the magnetic field supports the interpretation of the observed i on fluxes as a signature of the wavy motion of the boundary.