Nonlinear simulation studies of magnetospheric field line resonances

Details Nonlinear simulation studies of magnetospheric field line resonances Nonlinear simulation studies of magnetospheric field line resonances

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1764k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1764

Physics

2752 Mhd Waves And Instabilities (2149, 6050, 7836), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7839 Nonlinear Phenomena (4400, 6944)

Scientific paper

Field line resonances (FLRs) observed in the magnetosphere often have the amplitude of a few nT, which indicates that dB/B roughly satisfies ~0.01. The FLRs are excited by compressional wave energy via mode conversion, and there has been no apparent criterion on the maximum amplitude in the regime of linear approximations. Thus, such limited range of amplitude should be understood by including nonlinear saturation of FLRs, which have not been examined until now. In this study, the nature of nonlinear field line resonances (FLR) is studied by adopting full MHD simulations. The MHD code used here is based on the total variation diminishing (TVD) scheme and we have performed numerical simulations of FLR with its three- dimensional code. If the source perturbation is strongly impulsive and thus the timescale of the initial variations is sufficiently smaller than the convection timescale, FLRs are easily confirmed in these simulations. When the disturbance is sufficiently small, it is shown that linear properties of MHD wave coupling are well reproduced. In order to examine a nonlinear excitation of FLRs, the initial magnitude of disturbances is assumed to increase. Our results suggest that the maximum amplitude of FLRs become saturated at the level of the same order of dB/B as in observations. We present how FLRs behave differently for various disturbances both in both hot and cold regions.

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