Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611461a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,461-11,473.
Physics
19
Earth Magnetosphere, Magnetosonic Resonance, Magnetosphere-Ionosphere Coupling, Magnetospheric Instability, Cavities, Coupled Modes, Magnetoplasmadynamics, Nonlinearity, Solar Wind
Scientific paper
A two-dimensional, nonlinear hydromagnetic computer code is applied here to the problem of pure fast mode cavity resonances in the simplest possible box model of the magnetosphere in order to determine basic nonlinear effects of magnetospheric cavity modes. The results show that significant nonlinear effects can occur at maximum velocity v(0). The initial impulse develops into a relatively weak shock as it propagates into the magnetosphere. After cavity modes are set up, their temporal development is very different from the corresponding linear modes. In particular, the cavity mode frequencies are reduced and the temporal structure of the modes is apparently not well represented by sinusoidal functions. Much of the change in behavior can be attributed to a large distortion of the background plasma mass density. Expressions for the ponderomotive force as it applies to small but finite amplitude cavity modes are developed, and it is shown that these expressions are consistent with the simulation results.
Allan W.
Manuel John R.
Poulter E. M.
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