Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work...53c&link_type=abstract
In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 53-56(SEE N89-24910 18-75)
Astronomy and Astrophysics
Astrophysics
Electron Beams, Electrostatic Waves, Magnetohydrodynamic Stability, Plasma Frequencies, Wave Interaction, Earth Magnetosphere, Plasma Turbulence, Plasma-Electromagnetic Interaction, Reaction Kinetics, Space Plasmas
Scientific paper
The growth of electrostatic waves near the plasma frequency (fp) due to an unstable electron beam is investigated by solving the unmagnetized electrostatic dispersion equation numerically. The numerical solutions are compared with analytic theories for reactive (or fluid-type) and kinetic versions of the beam instability, and for the O'Neil/Malmberg connection of the beam and Langmuir modes. Conditions for growth significantly above or below fp are given. Three general results are found: (1) The unstable waves do not grow on a mode with Langmuir dispersion except in the limit of a very dilute beam with growth on O'Neil/Malmberg's connected mode; (2) The properties of the unstable mode depend strongly on beam parameters such as beam density, speed and temperature; and (3) The frequency of maximum growth frequently lies significantly above or below fp, and differs significantly from that predicted by the Langmuir dispersion relation. Results imply important consequences for theories of strong turbulence and nonlinear wave-wave processes, and observational identification of fp from observed wave frequencies.
No associations
LandOfFree
The electron beam instability revisited: Growth above and below f sub p does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The electron beam instability revisited: Growth above and below f sub p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The electron beam instability revisited: Growth above and below f sub p will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-828845