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Title: A particle-in-cell approach to obliquely propagating electrostatic waves

The electron-acoustic and beam-driven modes associated with electron beams have previously been identified and studied numerically. These modes are associated with Broadband Electrostatic Noise found in the Earth's auroral and polar cusp regions. Using a 1-D spatial Particle-in-Cell simulation, the electron-acoustic instability is studied for a magnetized plasma, which includes cool ions, cool electrons and a hot, drifting electron beam. Both the weakly and strongly magnetized regimes with varying wave propagation angle, θ, with respect to the magnetic field are studied. The amplitude and frequency of the electron-acoustic mode are found to decrease with increasing θ. The amplitude of the electron-acoustic mode is found to significantly grow at intermediate wavenumber ranges. It reaches a saturation level at the point, where a plateau forms in the hot electron velocity distribution after which the amplitude of the electron-acoustic mode decays.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Space Commercial Services Holdings (SCSH) Group, Somerset West (South Africa)
  2. (KTH), Stockholm (Sweden)
  3. (SANSA), Space Science, Hermanus (South Africa)
  4. University of KwaZulu-Natal, Durban (South Africa)
  5. (South Africa)
  6. South African National Space Agency (SANSA), Space Science, Hermanus (South Africa)
Publication Date:
OSTI Identifier:
22303615
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; AUGMENTATION; ELECTRON BEAMS; ELECTRON DRIFT; ELECTRONS; IONS; MAGNETIC FIELDS; PLASMA WAVES; POLAR CUSP; SIMULATION; WAVE PROPAGATION