Linear generation and nonlinear decay of electrostatic hydrogen cyclotron waves on auroral field lines
Thesis/Dissertation
·
OSTI ID:5265046
The linear generation of electrostatic hydrogen cyclotron (EHC) waves in the auroral acceleration region near an altitude of 1R/sub E/ is examined. A field-aligned electron drift and an ion beam are included simultaneously in the plasma model. Each of these has the capability to excite EHC waves. Two assumptions are made: (1) the plasma can be described by three Maxwellian species and, (2) the properties of observed EHC waves are the same as the properties of the linearly excited modes. With these assumptions and a plasma model based on S3-3 satellite data, it is concluded that EHC waves driven by an electron drift compare more favorably with observed EHC waves than those driven by an ion beam. Further, the temperature of the drifting electrons should be on the order of the temperature of the stationary ions. Saturation of a linearly excited EHC wave by coherent decay to another EHC wave and an ion acoustic mode is considered. Frequency and wave-number matching can be satisfied in this three-wave interaction if the daughter ion acoustic mode is oblique to the geomagnetic field. Many three-wave triads exist for a single parent. A calculation of the coupling coefficient between any three electrostatic waves in a uniformly magnetized plasma comprised of drifting Maxwellian species is derived.
- Research Organization:
- California Univ., Berkeley (USA)
- OSTI ID:
- 5265046
- Country of Publication:
- United States
- Language:
- English
Similar Records
Decay of electrostatic hydrogen cyclotron waves into ion acoustic modes on auroral field lines
Beam-driven acoustic solitary waves in the auroral acceleration region
Low frequency electrostatic waves in weakly inhomogeneous magnetoplasma modeled by Lorentzian (kappa) distributions
Journal Article
·
Sat Feb 28 23:00:00 EST 1987
· Journal of Geophysical Research; (United States)
·
OSTI ID:5399062
Beam-driven acoustic solitary waves in the auroral acceleration region
Journal Article
·
Sun Oct 01 00:00:00 EDT 1995
· Journal of Geophysical Research
·
OSTI ID:227164
Low frequency electrostatic waves in weakly inhomogeneous magnetoplasma modeled by Lorentzian (kappa) distributions
Journal Article
·
Tue Apr 15 00:00:00 EDT 2008
· Physics of Plasmas
·
OSTI ID:21120231