Physical Sciences Inc. (PSI), in cooperation with the Boston University Center for Space Physics, and under the sponsorship of the Air Force Research Laboratory Space Vehicle Directorate, has developed and tested a lightweight, multi-configuration sensor to monitor the space weather environment. The scintil-lator- based Low Energy Particle Imaging Spectrometer (LEPIS) is ideally suited to monitoring the lower energy (20 to 1000 keV) charged particle environment. The LEPIS design is also compatible with the weight, volume, and power requirements of nanosatellites (<0.5 kg, <0.5 W) charged particle. The LEPIS design does not rely upon a magnetic sector to discriminate between particle types; rather it takes advantage of cross-section characteristics and scintillator properties to discriminate. We have proven the feasibility of our approach; i.e., using thin films of materials to create particle-specific detectors, fiber-optically coupled to a position-sensitive photomultiplier tube. The result is a tremendous savings in weight and volume. A compel-ling aspect of our concept is its flexibility. In the early phase of this program, we optimized the sensor to detect low energy charged particles, the design is adaptable to different energy regimes. By simply changing the scintillator thickness and materials, the LEPIS sensor is configured to other energy regimes.