Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..75..273p&link_type=abstract
Astrophysics and Space Science, vol. 75, no. 2, Apr. 1981, p. 273-287.
Astronomy and Astrophysics
Astrophysics
12
Helical Windings, Magnetic Field Configurations, Magnetic Flux, Magnetohydrodynamic Stability, Solar Atmosphere, Solar Magnetic Field, Chromosphere, Fine Structure, H Alpha Line, Magnetic Variations, Solar Activity, Solar Flares, Solar Prominences, Sunspots
Scientific paper
A detailed review is given of evidence for the emergence of solar magnetic fields as helically twisted flux ropes, made up of hundreds of thousands of individually twisted flux fibers and reaching concentrations greater than 4000 gauss. The initial pitch angle of the twists is estimated as less than 10 deg in the submerged flux ropes and 1 deg in the fibers, with large-factor increases during (and following) emergence. The upward transmission of magnetic stresses and motions from submerged flux rope sections are major factors in solar physics, with the helical twists accounting for the creation of sunspots and for their stability, fine structure, and mode of decay. They are basic features of solar atmospheric structures, from the largest flare events and prominences to arch filaments and the smallest network components.
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