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Title: Low frequency electrostatic instabilities excited by injection of an electron beam in space

Abstract

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 ..cap omega../sub e/ << ..omega../sub pe/ in a non-isothermal 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.. << ..cap omega../sub i/ is found to be generated by the electrons flowing into the conductor. Both the ion 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. 11 refs., 9 figs.

Authors:
;
Publication Date:
Research Org.:
Princeton Univ., NJ (USA). Plasma Physics Lab.
OSTI Identifier:
6533913
Report Number(s):
PPPL-2578
ON: DE89006882
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRON BEAMS; PLASMA INSTABILITY; ION PLASMA WAVES; WAVE PROPAGATION; COLD PLASMA; COMPUTERIZED SIMULATION; DISPERSION RELATIONS; ELECTRON TEMPERATURE; MAGNETIC FIELDS; PHASE SPACE; SPACE VEHICLES; BEAMS; INSTABILITY; ION WAVES; LEPTON BEAMS; MATHEMATICAL SPACE; PARTICLE BEAMS; PLASMA; PLASMA WAVES; SIMULATION; SPACE; VEHICLES; 640301* - Atomic, Molecular & Chemical Physics- Beams & their Reactions; 640410 - Fluid Physics- General Fluid Dynamics

Citation Formats

Hwang, Y S, and Okuda, H. Low frequency electrostatic instabilities excited by injection of an electron beam in space. United States: N. p., 1989. Web. doi:10.2172/6533913.
Hwang, Y S, & Okuda, H. Low frequency electrostatic instabilities excited by injection of an electron beam in space. United States. https://doi.org/10.2172/6533913
Hwang, Y S, and Okuda, H. Wed . "Low frequency electrostatic instabilities excited by injection of an electron beam in space". United States. https://doi.org/10.2172/6533913. https://www.osti.gov/servlets/purl/6533913.
@article{osti_6533913,
title = {Low frequency electrostatic instabilities excited by injection of an electron beam in space},
author = {Hwang, Y S and Okuda, H},
abstractNote = {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 ..cap omega../sub e/ << ..omega../sub pe/ in a non-isothermal 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.. << ..cap omega../sub i/ is found to be generated by the electrons flowing into the conductor. Both the ion 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. 11 refs., 9 figs.},
doi = {10.2172/6533913},
url = {https://www.osti.gov/biblio/6533913}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {2}
}