Abstract
Spatial distribution of energetic electron intensities as observed by a detector on the Imp-3 satellite has been examined in order to study the location of the high latitude boundary of the stably-trapped zone of energetic particles at the noon meridian section of the magnetosphere. A region of enhanced electron intensities was found to exist which extends from the equatorial region of the stably-trapped zone to high latitudes along the day-side magnetospheric boundary. The location of the region is in very good agreement with that of the high latitude part of the stably-trapped zone predicted by Shavansky and Antonova and which covers the region of off-equatorial magnetic field intensity minima in the day-side magnetosphere. Experimental data also suggest that almost continuous leakage of energetic electrons takes place toward the earth from this part of the trapping region.
