A rocket measurement of low energy protons

he proton energy spectra from L = 2 to L = 3 were measured by a two-detector solid-state telescope carried by a rocket launched on 30 March 1965. The spectra were found to be well fitted by single exponentials of the form exp ( -E/E sub 0) for the two energy regions 0.2 = or <E = or <1.5 MeV and 1.5 = or <E = or <4.0 MeV. The energy parameter was found to be 0.4 = or <E sub 0 = or <1.2. The spectra were L dependent and in qualitative agreement with the inward radial diffusion theory. (Author).