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Modelling He and H Isotopes in the Radiation Belts

Selesnick, R. S. and Mewaldt, R. A. (1996) Modelling He and H Isotopes in the Radiation Belts. In: Radiation Belts: Models and Standards. American Geophysical Union , Washington, DC, pp. 123-128. ISBN 9780875900797.

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Nuclear interactions between inner zone protons and atoms in the upper atmosphere produce energetic H and He nuclei that are an additional radiation belt source. We calculate production rates of these isotopes from models of the inner zone proton intensity, the upper atmosphere drift averaged composition and densities, and cross-sections for the various interaction processes. For comparison with observations of radiation belt H and He isotopes, the production rates are combined with a model of the energy loss rate in the residual atmosphere to calculate particle intensities. Although the calculations are in principle straightforward, they depend on a detailed knowledge of the various model inputs, including models for radiation belt protons, and may also depend on the phase of the solar cycle. On the other hand, the results of the calculations, when compared with the observational data, can provide useful tests of the model inputs. Preliminary results show that the atmosphere is a significant source for inner zone ^4He, ^3He, and d.

Item Type:Book Section
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Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© 1996 American Geophysical Union. This work was supported by NASA under contract NAS5-30704 and grant NAGW-1919.
Group:Space Radiation Laboratory
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Space Radiation Laboratory1996-03
Record Number:CaltechAUTHORS:20140624-144048809
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46483
Deposited By: Deborah Miles
Deposited On:25 Jun 2014 22:15
Last Modified:10 Nov 2021 17:26

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