LEMMS
Low Energy Magnetospheric Measurement System
The Low Energy Magnetospheric Measurment System (LEMMS) provided by the Max Planck
Institut für Aeronomie in Göttingen Germany measures
high energy ion and electron energy and angular distributions from 20 keV to ~130
MeV. The mesurements are made with multiple solid state dectectors (SSD)
arranged in various combinations of singles counting, coincidence, anticoincidence, and
multiple detector sampling to sort the events by energy, and, for the higher
energies, mass species. Magnetic deflection is used to sort out the electrons
for separate measurement and to isolate the ion detectors from the electrons.
LEMMS is double ended with oppositely directed 15 deg. (lower energy range)
and 30 deg. (higher energy range) conical fields of view (FOV). To obtain angular
distributions it is mounted on a rotating platform which permits motor driven
rotations of the sensor head by 360 deg. about the spacecraft -Y axis (allowing for
views into the X, Z plane). The sensor with its motor drive is mounted on the
Fields-and Particles-Pallet, which can be viewed in the Spacecraft
Diagram and Spacecraft Photo. This instrument has a mass
of 6.72 kg and consumes about 5.2 W of nominal power. Its volume envelope
is about XXX by YYY by ZZZ cm.
