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Flute mode waves near ω L H excited by ion rings in velocity space
Author(s) -
Cattell Cynthia,
Hudson Mary
Publication year - 1982
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/gl009i010p01167
Subject(s) - ion , excited state , dispersion relation , physics , atomic physics , instability , lower hybrid oscillation , cyclotron , energy (signal processing) , computational physics , optics , mechanics , quantum mechanics
Discrete emissions at the lower hybrid frequency are often seen on the S3‐3 satellite. Simultaneous observation of perpendicularly heated ions suggests that these ions may provide the free energy necessary to drive the instability. Studies of the dispersion relation for k ∥ = 0 modes excited by warm ion rings in velocity space show that waves are excited with real frequencies near the lower hybrid frequency and with growth rates ranging from ∼0.01 to 1 times the ion cyclotron frequency. Numerical results are therefore consistent with the possibility that the observed ions are the free energy source for the observed waves.