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A time-dependent diffusion convection model for the long term modulation of cosmic raysA model is developed which incorporates to first order the direct effects of the time dependent diffusive propagation of interstellar cosmic rays in a slowly changing interplanetary medium. The model provides a physical explanation for observed rigidity-dependent phase lags in modulated spectra (cosmic ray hysteresis). The average distance to the modulating boundary during the last solar cycle is estimated.
Document ID
19750006628
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gallagher, J. J. (Maryland Univ. College Park, MD, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-141146
TR-74-114
Accession Number
75N14700
Funding Number(s)
CONTRACT_GRANT: NGL-21-002-006
CONTRACT_GRANT: NGL-21-002-033
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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