Cummings, A. C. and Stone, E. C. and Vogt, R. E.
(1973)
Analytic Approximations in the Study of the Solar Modulation of Electrons.
In:
Proceedings of the 13th International Cosmic Ray Conference.
Colorado Associated University Press
, Denver, CO, pp. 765-770.
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Abstract
Numerical solutions to the transport equation of galactic
cosmic rays in the interplanetary medium have been used to
investigate the applicability of commonly used approximate
analytic solutions for electrons (10 MeV to 10 GeV). We
find that for a given cosmic-ray diffusion coefficient:
(a) the "force-field" approximation is in reasonable agreement
with the numerical solution at energies ≳ 200 MeV, but
deviates significantly at lower energies, depending on the
shape of the interstellar electron spectrum, (b) the
"diffusion-convection" approximation agrees generally with
the numerical solution within a factor of ~ 2 over the
entire energy range.
| Item Type: | Book Section |
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| Additional Information: | © 1973 University of Colorado.
Provided by the NASA Astrophysics Data System.
This work supported by the National Aeronautics
and Space Administration, Grant NGR 05-002-160. One of us (Stone) was
an Alfred P. Sloan research fellow, and another (Cummings) was a NASA
Trainee during this work. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NGR 05-002-160 | | Alfred P. Sloan Research Fellowship | UNSPECIFIED | | NASA Traineeship | UNSPECIFIED |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1973-11 |
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| Record Number: | CaltechAUTHORS:20140409-091427238 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140409-091427238 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 44811 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
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| Deposited On: | 10 Apr 2014 21:14 |
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| Last Modified: | 20 Feb 2020 14:33 |
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