Numerical studies of tearing modes in a nearly singular forced current sheet equilibrium [Liewer and Payne, 1990> show that the modes saturate quasilin-early when the width of the magnetic island formed by the reconnection is on the order of several times the linear mode width which scales as Δr~(kS)-2/5, where S is the Lundquist number of k is the wavenumber. The modes saturate quasilinearly by flattening the current profile, converting magnetic energy into plasma energy. The longer wavelength modes, which saturate at higher levels, release levels, release the most energy. These modes may, nonlinearly, play a role in coronal heating when sharp current sheets form as a results of global magnetic stresses. ¿American Geophysical Union 1990 |