Low-frequency electrostatic instabilities excited by injections of an electron beam in space
- Princeton Univ., NJ (USA)
One-dimensional particle simulations have been carried out to study the low-frequency broadband electrostatic noise that propagates almost perpendicularly from the magnetic field line when a nonrelativistic electron beam is injected into space from a spacecraft. For T{sub e} = T{sub i} the electrostatic ion cyclotron waves appear as well as the waves near the lower hybrid frequency. When the magnetic field is reduced so that {Omega}{sub e} << {omega}{sub pe} in a nonisothermal plasma. T{sub e} > T{sub i}, oblique ion acoustic instabilities appear to propagate almost perpendicular to the magnetic field. In addition, a very low frequency mode at {omega} << {Omega}{sub i} is found to be generated by the electrons flowing into the conductor. Both the injected beam electrons as well as the ambient electrons flowing into the spacecraft are responsible for generating those instabilities, which accelerate ions perpendicular to the magnetic field.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6048457
- Journal Information:
- Journal of Geophysical Research; (USA), Vol. 94:A8; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
BEAM-PLASMA SYSTEMS
ION WAVE INSTABILITY
EARTH ATMOSPHERE
BEAM INJECTION
COMPUTERIZED SIMULATION
ELECTRON BEAMS
ELECTRONS
GEOMAGNETIC FIELD
HOMOGENEOUS PLASMA
ION WAVES
WAVE PROPAGATION
BEAMS
ELEMENTARY PARTICLES
FERMIONS
INSTABILITY
LEPTON BEAMS
LEPTONS
MAGNETIC FIELDS
PARTICLE BEAMS
PLASMA
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PLASMA WAVES
SIMULATION
640201* - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena