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The phase relationship between gyrophase‐bunched ions and MHD‐like waves
Author(s) -
Fuselier S. A.,
Thomsen M. F.,
Gary S. P.,
Bame S. J.,
Russell C. T.,
Parks G. K.
Publication year - 1986
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/gl013i001p00060
Subject(s) - magnetohydrodynamics , instability , ion , physics , phase (matter) , magnetic field , plasma , atomic physics , shock wave , bow wave , beam (structure) , shock (circulatory) , bow shock (aerodynamics) , ion beam , computational physics , field (mathematics) , mechanics , optics , solar wind , nuclear physics , quantum mechanics , medicine , mathematics , pure mathematics
Recent calculations and computer simulations of the right‐hand resonant ion beam instability have indicated that gyrophase‐bunched ion distributions may be generated as a first step in the disruption of field‐aligned beams. Theory predicts a distinct phase angle relationship between the gyrovelocity of the phase‐bunched ions and the wave magnetic field. In this paper, observations of such a relationship between gyrophase‐bunched ions and MHD‐like waves upstream from the Earth's bow shock are presented. The observed phases are in accord with the theoretical predictions of the right‐hand resonant ion beam instability.