Low Energy Telescope (LET)
Caltech, GSFC, JPL

LET is a special double-fan arrangement of 14 solid state detectors designed to measure protons and helium ions from ~1.5 to 13 MeV/nucleon, and heavier ions from ~2 to 30 MeV/nucleon. LET uses a standard dE/dx vs. E technique, identifying particles that stop at depths of ~20-70 microns and ~70-2000 microns corresponding to two general energy ranges. The large field of view spans from 20 deg above to 20 deg below the ecliptic plane, and extends 65 deg to either side of the forward and backward Parker Spiral field directions in the ecliptic plane. LET's large geometric factor also ensures the detection of even small SEP events.

SWEA | STE | MAG | SEPT | SIT | LET | HET
Boom Suite | SEP Package