CONDUCT A CONCEPT STUDY OF THE INITIALLY PROPOSED INVESTIGATION AND PROVIDE A REPORT ON THIS STUDY BY JUNE 3 2019. PRECIPITATION INTO THE UPPER ATMOSPHERE IS ONE OF THE PRIMARY SOURCES OF LOSS FROM THE RADIATION BELTS. NUMEROUS SPACECRAFT HAVE ATTEMPTED TO MEASURE THIS ENERGETIC ELECTRON PRECIPITATION (EEP) FROM LOW-EARTH ORBIT (LEO); HOWEVER CURRENT INSTRUMENTATION IS NOT ABLE TO RESOLVE THE LOSS CONE ANGLE NOR MEASURE THE PITCH ANGLE DISTRIBUTION AND THUS THE ENERGY DEPOSITION IN THE ATMOSPHERE HAS A LARGE UNCERTAINTY. FURTHERMORE PARTICLE DETECTORS ON SPACECRAFT PROVIDE IN-SITU DETECTION ONLY AND SINGLE-SPACECRAFT MISSIONS CANNOT PROVIDE INSTANTANEOUS SPATIAL INFORMATION ABOUT THE PRECIPITATION PATCHES.

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