OBSERVATIONS OF INNER AND OUTER ZONE ELECTRONS SINCE DECEMBER 1965
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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A Silicon Surface Barrier Detector Electron Telescope measuring Integral and Differential Electron Energy Spectra over the range of 130 KEV to 4.5 MEV was placed into orbit in late 1965. The initial orbit had an inclination of 26.6 degrees, apogee of 33,600 KM, perigee of 200 KM, and a mean orbital period of 589.6 minutes. The data from the experiment are presented in terms of single orbit passes on selected days showing outer zone maxima in omnidirectional flux intensity for 130 KEV, 700 KEV, and 2.5 MEV integral Spectra in the region near L4, and a minimum near L3.5 which characterizes the slot between the inner and outer zones. Diurnal variations are characterized by flux changes which show marked correlation with K sub p index at L6. The degree of correlation decreases with decreasing L value. Spectral steepening is seen to occur during periods of increased geomagnetic activity. The diurnal flux changes also exhibit energy vs. time dependencies with the higher energy electron fluxes generally reaching their maximum later in time.
- Atmospheric Physics