In this paper, the long-term relativistic electron behavior in the often overlooked "slot" region and the inner belt was studied using the 2--6 MeV electron data from the SAMPEX satellite during 1992--2004. In particular, we investigated the penetration of the 2--6 MeV electrons to the slot region, their flux enhancement in the inner belt, and how these two processes are related to magnetospheric activity levels and solar wind parameters. It is found that the 2--6 MeV electron penetration (L 550 km s-1) as well as low solar wind density (~4.4 cm-3). Either a couple of very extreme storms or recurrent intense storms will create conditions favorable for the MeV electron enhancement in the inner belt. However, without high-speed solar wind on average, a series of intense storms alone are not sufficient to create inner belt electron flux enhancement.