LOW-ENERGY PROTON EXPERIMENT ON ISEE-C - BALOGH, A; VANDIJEN, G; VANGENECHTEN, J; HENRION, J; HYNDS, R; KORFMANN, G; IVERSEN, T; VANROOIJEN, J; SANDERSON, T; STEVENS, G; WENZEL, KP (IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1978)