Abstract
From time to time, in consequence of solar flares, intense high energy particle flux intensities are observed at polar cap latitudes (these events are known as Solar Particle Events, or SPE). During electron rich SPEs, low altitude polar orbiting satellites detect a remarkably constant high energy particle flux which forms a so called solar plateau. It was shown that the electron flux in the plateau region is equal to the solar electron flux intensity in the solar wind [1]. A characteristics of this plateau is a sharp boundary at a latitude which is usually located well above the outer boundary of the radiation belt. It was long believed that this Solar electron Boundary (SBE) of the plateau demarcates the boundary between open and closed magnetospheric field lines (OCB) [2]. This concept is still in use, for instance, in locating low energy precipitation structures observed at high latitudes [3], [4].
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