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Published 1974 | public
Book Section - Chapter

The Magnetic Structure of Plages

Abstract

Every sunspot group is surrounded by regions of weaker magnetic field; traditionally those parts which appear in emission in resonance lines are called plages. There is a more extensive region of enhanced magnetic field which is not bright because the magnetic field is horizontal; this region is easily discernible by dark horizontal fibrils in Hα and is included in our discussion. The plage includes most of the magnetic field in an active center and is the locus of most of the flares.

Additional Information

© International Astronomical Union 1974. This research was supported by NASA under NGR 05-002-034 and by NSF Atmospheric Sciences program under GA-24015.

Additional details

Created:
August 22, 2023
Modified:
January 15, 2024