Analysis of plasma signatures of plasma transients and, specifically, transients observed in the LLBL magnetospheric flank region shows that these transients have a non-symmetric plasma structure with a faster and denser leading part and a turbulent trailing part. Several plasma features (DMTEs) keep nearly the same structure while changing their properties in a systematic way with distance from the magnetopause. The use of an Ti-Ni dependence leads to a clearer distinction between the leading and trailing parts of the plasma structures, as well as to a distinct indication of the systematic variation of plasma properties of plasma transients with distance from the magnetopause crossing. The Interball data, as well as some previous studies [Vaisberg et al., 1997 a, b], show that there are different classes of FTEs. Analysis of the plasma and magnetic structure of FTEs/DMTEs and their evolution with distance from the magnetopause suggest that Disconnected Magnetosheath Transfer Events penetrate into the magnetosphere where both the magnetic field structure and magnetosheath-like ion characteristics evolve in the LLBL. Interpretation of the plasma structures defined as Disconnected Magnetosheath Transfer Events with a leading dense ion core followed by a turbulent wake is proposed. There is evidence that the described events are associated with (non-stationary) reconnection.