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The simulated features of heliospheric cosmic-ray modulation with a time-dependent drift model. III - General energy dependenceThe time-dependent cosmic-ray transport equation is solved numerically in an axially symmetric heliosphere. Gradient and curvature drifts are incorporated, together with an emulated wavy neutral sheet. This model is used to simulate heliospheric cosmic-ray modulation for the period 1985-1989 during which drifts are considered to be important. The general energy dependence of the modulation of Galactic protons is studied as predicted by the model for the energy range 1 MeV to 10 GeV. The corresponding instantaneous radial and latitudinal gradients are calculated, and it is found that, whereas the latitudinal gradients follow the trends in the waviness of the neutral sheet to a large extent for all energies, the radial gradients below about 200 MeV deviate from this general pattern. In particular, these gradients increase when the waviness decreases for the simulated period 1985-1987.3, after which they again follow the neutral sheet by increasing rapidly.
Document ID
19920059808
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Potgieter, M. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Le Roux, J. A.
(Maryland, University College Park, United States)
Date Acquired
August 15, 2013
Publication Date
June 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 392
Issue: 1 Ju
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
92A42432
Funding Number(s)
CONTRACT_GRANT: NAG2-627
Distribution Limits
Public
Copyright
Other

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