Electromagnetic ion beam instabilities: Hot beams at interplanetary shocks

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/162797· OSTI ID:5548982

Gary, S P

This paper considers Vlasov instabilities driven by a very hot ion beam streaming parallel to a magnetic field. The linear theory of electromagnetic instabilities driven by such a beam in a homogeneous, collisionless, nonrelativistic plasma is used. Numerical solutions of the full linear dispersion equation for bi-Maxwellian distribution functions are presented. If the thermal speed of the beam is greater than its drift speed, the two dominant modes are the right-hand and left-had resonant ion beam instabilities. The parametric dependencies of the threshold drift speeds and growth rates for both modes are presented. In particular, the thresholds are shown to be sensitive functions of the beam temperature anisotropies. Arguments are presented that these two modes is sufficient to account for the amplitudes of MHD-like waves observed at such shocks.

• Research Organization: Earth and Space Sciences Division, University of California, Los Alamos National Laboratory
• OSTI ID: 5548982
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 288:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
ANALYTICAL SOLUTION
BEAM-PLASMA SYSTEMS
BEAMS
BOLTZMANN-VLASOV EQUATION
COLLISIONLESS PLASMA
COMPUTERIZED SIMULATION
DIFFERENTIAL EQUATIONS
DISPERSION RELATIONS
ELECTROMAGNETISM
EQUATIONS
HOMOGENEOUS PLASMA
INSTABILITY
INSTABILITY GROWTH RATES
INTERPLANETARY SPACE
ION BEAMS
MAGNETIC FIELDS
MAGNETISM
NUMERICAL SOLUTION
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
PLASMA ACCELERATION
PLASMA INSTABILITY
SHOCK WAVES
SIMULATION
SPACE