Published 1973
| Published
Book Section - Chapter
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Analytic Approximations in the Study of the Solar Modulation of Electrons
- Creators
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Cummings, A. C.
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Stone, E. C.
- Vogt, R. E.
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.
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.Attached Files
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Additional details
- Eprint ID
- 44811
- Resolver ID
- CaltechAUTHORS:20140409-091427238
- NGR 05-002-160
- NASA
- Alfred P. Sloan Research Fellowship
- NASA Traineeship
- Created
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2014-04-10Created from EPrint's datestamp field
- Updated
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2020-02-20Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1973-11