ON THE RELATIONSHIP BETWEEN CORONAL MASS EJECTIONS AND MAGNETIC CLOUDS

We compare the substructures of the 1997 February 07 coronal mass ejec tion (CME) observed near the Sun with a corresponding event in the int erplanetary medium to determine the origin of magnetic clouds (MCs). W e find that the eruptive prominence core of the CME observed near the Sun may not directly become a magnetic cloud as suggested by some auth ors and that it might instead become the ''pressure pulse'' following the magnetic cloud. We substantiate our conclusions using time of arri val, size and composition estimates of the CME-MC substructures obtain ed from ground based, SOHO and WIND observations.