INTERBALL observations of the dayside magnetopause

The high-apogee Interball Tail Probe crosses the magnetopause in two latitude ranges: one is close to the equator, and the other is at middle and high latitudes. A brief description of dayside magnetopause observations from the fast plasma analyzer SCA-1 is given. We give examples of plasma regimes observed at low latitudes that show evidence for plasma cloud penetration into the magnetosphere. Nonstationary reconnection is suggested as a possible mechanism for the observed near-magnetopause structures.