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Ponderomotive saturation of magnetospheric field line resonances
Author(s) -
Rankin R.,
Frycz P.,
Tikhonchuk V. T.,
Samson J. C.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl01311
Subject(s) - physics , ponderomotive force , field line , computational physics , saturation (graph theory) , nonlinear system , magnetic field , quantum electrodynamics , alfvén wave , atomic physics , magnetohydrodynamics , quantum mechanics , mathematics , combinatorics
Compressional Alfvén waves in the terrestrial magnetospheric cavity constitute a discrete spectrum of global modes which can resonate with specific components of the continuum spectrum of shear Alfvén wave (SAW) field line resonant frequencies. We investigate the effect of the ponderomotive force (PF) of excited standing SAWs on the nonlinear saturation of field line resonances (FLRs). In low β plasmas FLR saturation occurs due to a nonlinear phase slip between the fast mode driver and SAW field. Ponderomotive forces also lead to density depletions at the ionospheres, nonlinear narrowing of the FLR and meridional scales comparable to those embedded within temporally modulated discrete auroral arcs. Observational features relating to these effects are discussed.