Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..85..369l&link_type=abstract
Astrophysics and Space Science, vol. 85, no. 1-2, July 1982, p. 369-380.
Astronomy and Astrophysics
Astrophysics
Electromagnetic Radiation, Electron Beams, Magnetospheric Instability, Plasma-Particle Interactions, Propagation Velocity, Cold Plasmas, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Plasma Layers, Velocity Distribution
Scientific paper
The ordinary mode electron instabilities excited by the velocity gradients of bouncing electron beams in the earth's magnetosphere are studied. Three types of instabilities are found: (1) a B-gradient resonance electron instability; (2) an ion cyclotron instability; and (3) an unmagnetized ions instability. The B-gradient resonance instability can occur only when the magnetic field has a gradient, which produces an effect similar to the Cerenkov resonance but in the transverse direction when the wave frequency becomes nearly equal to the local electron magnetic drift frequency. Ion cyclotron and unmagnetized ions instabilities do not require the presence of density and magnetic field gradients; they are driven solely by the velocity gradients of the electron beams.
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