Open AccessResonators for hydromagnetic waves in the magnetosphere
Author(s) -
Klimushkin D. Yu.
Publication year - 1998
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/97ja02193
Subject(s) - physics , magnetosphere , ring current , magnetohydrodynamics , plasmasphere , earth's magnetic field , geophysics , curvature , resonator , current (fluid) , magnetic field , standing wave , plasma , field line , line of force , computational physics , mechanics , classical mechanics , optics , geometry , mathematics , quantum mechanics , thermodynamics
This paper is concerned with the structure of hydromagnetic waves with respect to finite plasma pressure and the curvature of field lines in those magnetospheric regions where magnetospheric parameters (Alfvén velocity, the quantity β, and equilibrium current) have extrema (the region of plasmapause and partial ring current). It is shown that hydromagnetic waves in these regions they can have the structure of a standing wave not only in the geomagnetic field direction but also across magnetic shells (such a structure is called the “MHD resonator”). It is hypothesized that radially polarized Pc4 pulsations as observed in the magnetosphere represent resonator‐enclosed waves in the region of partial ring current.