Physics – Plasma Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..47l&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 10, pp. 47-1, CiteID 1540, DOI 10.1029/2003GL016929
Physics
Plasma Physics
8
Space Plasma Physics: Kinetic And Mhd Theory, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities
Scientific paper
Nonlinear dynamics of a dispersive field line resonance (FLR) is investigated in a dipolar magnetic geometry using a new finite element code TOPO. Time dependent dispersion and steepening of the perpendicular Alfvén velocity profile lead to the acceleration of dispersive effects and to localization of the FLR within an ionospheric density cavity. Consequently, shear Alfvén waves are trapped between turning points inside nonlinear density perturbations. This results in a complicated nonlinear FLR structure and an associated overlap of timescales for dispersion and nonlinearity. We show that nonlinear effects lead to fine scale structuring produced by the interplay of nonlinear and dispersive effects. We discuss the relevance of our results to observations of FLR's in the auroral zone.
Lu Jian-Yong
Marchand Régine
Rankin Robert
Tikhonchuk Vladimir T.
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