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A saturation mechanism for the Farley‐Buneman instability
Author(s) -
Otani Niels F.,
Oppenheim Meers
Publication year - 1998
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 - 10.1029/98gl50868
Subject(s) - instability , saturation (graph theory) , physics , electrojet , mechanics , electron , magnetic field , computational physics , condensed matter physics , geophysics , quantum mechanics , earth's magnetic field , mathematics , combinatorics
Studies with a reduced‐mode two‐fluid model have revealed a promising candidate for the saturation mechanism of the Farley‐Buneman instability in the daytime equatorial electrojet. The mechanism operates by redistributing the zero‐order electron E × B flow field. Secondary waves generated nonlinearly by the instability are responsible for the flow field modification. Saturation occurs because the modified flow reduces the principal charge transport responsible for the growth of the primary wave. Two‐dimensional particle simulations of the instability exhibit saturation via the same mechanism.