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Title: Sheath-induced distortions in particle distributions near enhanced polar outflow probe particle sensors

We discuss sheath and kinetic effects on ion and electron distribution functions at the aperture of enhanced Polar Outflow Probe particle sensors. For this purpose, the interaction between the CASSIOPE spacecraft and space environment is simulated fully kinetically using the electrostatic Particle In Cell code PTetra. The simulations account for the geometry of the main features of the spacecraft body, the booms, and the sensors. In addition to the background plasma, the model also accounts for Earth magnetic field. The plasma parameters assumed in the simulations are obtained from the latest version of the International Reference Ionosphere (IRI) model and the value of magnetic field is obtained from the International Geophysical Reference Field model. Our analysis shows significant distortions in the ion distribution function in the plane of the sensor aperture, as well as in the direction along the boom holding the sensor. We argue that significant distortions and asymmetries should also occur at the aperture of the suprathermal electron imager when suprathermal electrons are detected, with energies of 5‚ÄČeV or more.
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2E1 (Canada)
  2. (Pakistan)
  3. Department of Physics, University of Alberta, Edmonton, T6G 2E1 Alberta (Canada)
Publication Date:
OSTI Identifier:
22304095
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 7; 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; ASYMMETRY; DISTRIBUTION FUNCTIONS; ELECTRONS; MAGNETIC FIELDS; PLASMA; SENSORS; SIMULATION