Abstract
The identification of the source and loss mechanisms is still the outstanding problem of radiation belt research. Part of the problem encountered in testing theoretical concepts has been the incompleteness of the available data. Several surveys of the trapped proton population have been performed previously (Davis and Williamson, 1963; Freden et al., 1965; Fillius, 1966; Gabbe and Brown, 1966; Mihalov and White, 1966; Vernov et al., 1967; De Forest, 1970; Burns and Krimigis, 1971). Only a few experiments, however, have covered a wide enough energy range to allow the study of systematic spectral variations over a wide spatial region. In the inner belt, measurements of protons with energies below about 10 MeV have been generally scarce due to instrumental problems caused by penetrating protons or by electrons.
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Hovestadt, D., Achtermann, E., Ebel, B., Häusler, B., Paschmann, G. (1972). New Observations of the Proton Population of the Radiation Belt Between 1.5 and 104 Mev. In: McCormac, B.M. (eds) Earth’s Magnetospheric Processes. Astrophysics and Space Science Library, vol 32. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2896-7_11
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