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Simulations of the mean solar magnetic field during sunspot cycle 21Regarding new bipolar magnetic regions as sources of flux, the evolution of the photospheric magnetic field during 1976-1984 was computed and the corresponding evolution of the mean line-of-sight field as seen from earth was derived. A good, but imperfect, agreement was obtained between the observed mean field and the field computed for a nominal choice of flux transport parameters. The response of the computed mean field to variations in the transport parameters and the source properties was determined. The results suggest that the mean-field evolution is a random-walk process with dissipation. New eruptions of flux produce the random walk, and together differential rotation, meridional flow, and diffusion provide the dissipation. The net effect of each new source depends on its strength and orientation and on the time elapsed before the next eruption.
Document ID
19860036814
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sheeley, N. R., Jr.
(Naval Research Lab. Washington, DC, United States)
Devore, C. R.
(Naval Research Lab. Washington, DC, United States)
Boris, J. P.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: Solar Physics
Volume: 98
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
86A21552
Funding Number(s)
CONTRACT_GRANT: DPR-W14429
Distribution Limits
Public
Copyright
Other

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