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Hydraulic concentration of magnetic fields in the solar photosphere. I - Turbulent pumpingObservations suggest that most of the magnetic flux through the solar photosphere is concentrated in vertical filaments in the supergranule boundaries. Each filament appears to contain about 3 times 10 to the 18-th power maxwells, in the form of a field of 500 gauss or more, over a diameter of 700 km or less. The magnetic energy density in the filaments is 100 times the observed kinetic energy density of the observed supergranule motions, but comparable to the kinetic energy density of the granules. Force-free field configurations cannot duplicate the observational numbers, nor can such cooling effects as are believed responsible for the intense fields in sunspot umbrae. We point out a simple hydraulic mechanism (turbulent pumping) that appears to account for the observed concentration of fields.
Document ID
19740048656
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Parker, E. N. (Chicago, University Chicago, Ill., United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1974
Publication Information
Publication: Astrophysical Journal
Volume: 189
Subject Category
SPACE SCIENCES
Funding Number(s)
CONTRACT_GRANT: NGL-14-001-001
Distribution Limits
Public
Copyright
Other