The objective of the experiment (E8) was to study the origin
and the distribution mechanism of low-energy electrons and protons. The
instrument, a magnetic spectrometer, consisted of six semiconductor detectors
with the field of view in the plane of the ecliptic. Species separation was
achieved by an inhomogeneous magnetic field oriented perpendicular to the
particle path. Four electron and two proton detectors measured electrons
from 17 to 835 keV and protons from 21 to 677 keV. The proton measurements
were made with a two-detector telescope employing coincidence and anticoincidence
logic. Both particle species were measured in 16 energy channels through
pulse-height analysis. For further information see pp. 261-263 of
Raumfahrtforschung, v. 19, n. 5, 1975.