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On the origin of the MeV energy nucleon flux associated with CIRsMeasurements of recurrent enhancements of interplanetary nucleon flux in the MeV energy range are presented and interpreted. The features recur at the solar rotation period in association with stream-stream plasma interaction regions corotating with the sun. At distances from the sun less than 1 AU, the maximum intensities of the hydrogen and helium components increase with increasing distance between 300%/AU and 600%/AU. A model is proposed which predicts the acceleration of nuclei from keV plasma energies to MeV energies by means of transit time damping of magnetosonic waves as solar wind plasma flows from the sun. Numerical solutions of the transport equation are derived to demonstrate that the model does not reproduce radial variations of hydrogen and helium fluxes, and estimates are made of the radial diffusive mean free path. Finally, the observations are found to be consistent with nucleon acceleration at the CIR shocks beyond 1 AU with subsequent diffusion toward the sun.
Document ID
19820028642
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Christon, S. P.
(Chicago, University Chicago, IL, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
Solar Physics
Accession Number
82A12177
Funding Number(s)
CONTRACT_GRANT: NSF ATM-79-24593
CONTRACT_GRANT: NSG-7288
CONTRACT_GRANT: NAS5-25731
Distribution Limits
Public
Copyright
Other

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