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Changes in radial gradients of low-energy cosmic rays between solar minimum and maximum: - Observations from 1 to 31 AUObservations of the fluxes and radial gradients of protons and helium (with energies of 10-70 Mev per n) between the period of minimum solar modulation ending in 1977 and the period of maximum modulation in 1981-1983 show that, over the radial range 1-31 AU, radial gradients decreased for both species from their solar minimum values (5-10 percent per AU for galactic protons and helium) to values of 2-4 percent per AU or less. For these low-energy cosmic rays it is found that the variation in modulation with the phase of the solar cycle is much stronger at radii of 20-30 AU than at 1 AU, and that at solar maximum, more than 99 percent of the total modulation takes place beyond 31 AU.
Document ID
19850044874
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mckibben, R. B.
(Chicago Univ. Chicago, IL, United States)
Pyle, K. R.
(Chicago Univ. Chicago, IL, United States)
Simpson, J. A.
(Chicago, University Chicago, IL, United States)
Date Acquired
August 12, 2013
Publication Date
February 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 289
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
85A27025
Funding Number(s)
CONTRACT_GRANT: NAS2-11126
CONTRACT_GRANT: NSF ATM-82-06418
CONTRACT_GRANT: NAS5-25731
Distribution Limits
Public
Copyright
Other

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