Electromagnetic ion beam instabilities: II

Journal Article · Sun Dec 01 04:00:00 EST 1985 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865101· OSTI ID:5014444

Gary, S P; Madland, C D; Tsurutani, B T

This paper extends the results of Gary et al. (Phys. Fluids 27, 1852 (1984)). That paper examined the linear theory of electromagnetic instabilities driven by an ion beam streaming along a magnetic field in a homogeneous Vlasov plasma, emphasizing the parametric dependence of the instability growth rates. This paper considers the parametric dependence of the real frequency at maximum growth of two such instabilities with right-hand polarization. It is shown that the right-hand resonant ion beam instability can have maximum growth at frequencies near the ion-cyclotron frequency if the beam--main component relative drift speed is about twice the Alfven speed and at least one of the following conditions holds: the ion beta or the beam--main component relative temperature are sufficiently small, or the perpendicular-to-parallel beam temperature ratio is sufficiently large. These results support the identification of the right-hand resonant instability as the source of the large amplitude magnetic fluctuations observed upstream of slow shocks in the Earth's magnetotail.

• Research Organization: Earth and Space Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5014444
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:12; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOLTZMANN-VLASOV EQUATION
DIFFERENTIAL EQUATIONS
EQUATIONS
HOMOGENEOUS PLASMA
INSTABILITY
INSTABILITY GROWTH RATES
MAGNETIC FIELDS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
RADIATION STREAMING