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Simulations of MHD Wave Propagation and Coupling in a 3‐D Magnetosphere
Author(s) -
Wright Andrew N.,
Elsden Thomas
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja027589
Subject(s) - physics , magnetosphere , magnetohydrodynamics , magnetohydrodynamic drive , magnetopause , alfvén wave , polarization (electrochemistry) , dipole , toroid , computational physics , field line , noon , coupling (piping) , toroidal and poloidal , magnetic field , classical mechanics , quantum electrodynamics , plasma , quantum mechanics , mechanical engineering , chemistry , astronomy , engineering
A novel simulation grid is devised that is optimized for studying magnetohydrodynamic (MHD) wave coupling and phase mixing in a dipole‐like magnetic field. The model also includes flaring on the dawn and dusk flanks. The location of the magnetopause is quite general. In particular, it does not have to coincide with a coordinate surface. Simulations indicate the central role of global fast waveguide modes. These switch from being azimuthally standing in nature at noon, to propagating antisunward on the flanks. The field line resonances (FLRs) seen in the simulation results are three dimensional and not strictly azimuthally polarized. When a plume is present, the FLRs cross a range of 2 in L shell, and have a polarization that is midway between toroidal and poloidal.