Abstract
This paper summarizes briefly the plasma observations in the magnetospheric entry layer and its environment made by the Max-Planck Institute (MPI) instrument aboard the Heos 2 satellite. The main results are: 1. (1) the clear distinction between the entry layer (and its low-latitude extension) and the plasma mantle, 2. (2) the establishment of a further division between the entry layer proper in the high-latitude polar cusp regions, and a less dense layer at lower latitudes. If one also considers the observed lack of correlation between the properties of the boundary layers and the orientation of the external magnetic field, and the failure to detect the characteristic plasma flow expected from magnetic merging in the sub-solar region, a reconsideration of the processes and the location of solar wind plasma entry into the magnetosphere appears necessary.
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