Speaker
Michael Mond
(Ben-Gurion University, Beer Sheva, Israel)
Description
A new non-dissipative mechanism is proposed for the saturation of the axisymmetric
magneto-rotational (MRI) instability in thin Keplerian disks that are subject to an
axial magnetic field. The proposed mechanism relies on the energy transfer from the
MRI to stable magnetosonic (MS) waves. A second order Duffing-like amplitude equation
for the initially unstable MRI modes is derived. The solutions of that equation
exhibit bursty nonlinear oscillations with a constant amplitude that signifies the
saturation level of the MRI. Those results are verified by a direct numerical
solution of the full nonlinear reduced set of thin disk magnetohydrodynamics equations.
Primary authors
Dmitry V. Bisikalo
(Institute of Astronomy of the Russian Academy of Science, Moscow)
Edward Liverts
(Ben-Gurion University, Beer Sheva, Israel)
Michael Mond
(Ben-Gurion University, Beer Sheva, Israel)
Orkan M. Umurhan
(University of California, Merced, CA)
Yuri M. Shtemler
(Ben-Gurion University, Beer Sheva, Israel)
