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Atmospheric Production of Radiation Belt Light Isotopes

Selesnick, R. S. and Mewaldt, R. A. (1996) Atmospheric Production of Radiation Belt Light Isotopes. Journal of Geophysical Research A, 101 (A9). pp. 19745-19757. ISSN 0148-0227. doi:10.1029/96JA01746.

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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. Initial results show that the atmosphere is a significant source for inner zone ^4He, ^3He, and ^2H.

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Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© 1996 American Geophysical Union. Received March 12, 1996; revised May 16, 1996; accepted May 23, 1996. Paper number 96JA01746. We thank J. R. Cummings for the SAMPEX He data, M. D. Looper and J. B. Blake for the SAMPEX H data, and K. Langanke for help with the cross section data. This work was supported by NASA under contract NAS5-30704 and grant NAGW-1919. The editor thanks R. B. McKibben and D. G. Mitchell for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1996-10
Issue or Number:A9
Record Number:CaltechAUTHORS:20140703-213014364
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Official Citation:Selesnick, R. S., and R. A. Mewaldt (1996), Atmospheric production of radiation belt light isotopes, J. Geophys. Res., 101(A9), 19745–19757, doi:10.1029/96JA01746
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46826
Deposited By: Deborah Miles
Deposited On:10 Jul 2014 14:51
Last Modified:10 Nov 2021 17:29

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