http://arxiv.org/abs/2205.01298
Straining of magnetic fields by large-scale shear flow, generally assumed to lead to intensification and generation of small scales, is re-examined in light of the persistent observation of large-scale magnetic fields in astrophysics. It is shown that in magnetohydrodynamic turbulence, unstable shear flows have the unexpected effect of sequestering magnetic energy at large scales, due to counteracting straining motion of nonlinearly excited large-scale stable eigenmodes. This effect is quantified via dissipation rates, energy transfer rates, and visualizations of magnetic field evolution by artificially removing the stable modes.
B. Tripathi, A. Fraser, P. Terry, et. al.
Wed, 4 May 22
48/48
Comments: Letter submitted to Physics of Plasmas; A simulation movie embedded in Fig. 5; Supplementary text available at this https URL