Electromagnetic ion instabilities in a cometary environment

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA093iA01p00235· OSTI ID:6092724

Gary, S P; Madland, C D ^[1]

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1. Los Alamos National Lab., NM (United States)

This paper considers the linear theory of electromagnetic ion beam and ion ring-beam instabilities in a homogeneous Vlasov plasma. Propagation parallel or antiparallel to a uniform magnetic field and frequencies at or below the proton cyclotron frequency are considered. For parameters representative of the distant cometary environment. They show that instabilities with right-hand polarization in the zero momentum frame have larger linear growth rates than left-hand polarized instabilities at {alpha} values up to 90{degrees} where {alpha} is the angle between the solar wind velocity and the uniform interplanetary magnetic field. If both a proton beam and an oxygen beam are present with {alpha}=0{degrees}, two right-hand resonant instabilities may grow; these two modes are distinct and relatively independent of one another for a very wide range of proton/oxygen beam density ratios.

• OSTI ID: 6092724
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 93:A1; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

660000* -- Physics-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAMS
COLLISIONLESS PLASMA
COMETS
DISTANCE
ENERGY
FREE ENERGY
HOMOGENEOUS PLASMA
INSTABILITY
INSTABILITY GROWTH RATES
INTERACTIONS
ION BEAMS
MAGNETIC FIELDS
NUCLEON BEAMS
PARTICLE BEAMS
PHYSICAL PROPERTIES
PLASMA
PLASMA INSTABILITY
POLARIZATION
PROTON BEAMS
SOLAR ACTIVITY
SOLAR WIND
THERMODYNAMIC PROPERTIES
VELOCITY
WAVE PROPAGATION