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Title: Effect of excess superthermal hot electrons on finite amplitude ion-acoustic solitons and supersolitons in a magnetized auroral plasma

The effect of excess superthermal electrons is investigated on finite amplitude nonlinear ion-acoustic waves in a magnetized auroral plasma. The plasma model consists of a cold ion fluid, Boltzmann distribution of cool electrons, and kappa distributed hot electron species. The model predicts the evolution of negative potential solitons and supersolitons at subsonic Mach numbers region, whereas, in the case of Cairn's nonthermal distribution model for the hot electron species studied earlier, they can exist both in the subsonic and supersonic Mach number regimes. For the dayside auroral parameters, the model generates the super-acoustic electric field amplitude, speed, width, and pulse duration of about 18 mV/m, 25.4 km/s, 663 m, and 26 ms, respectively, which is in the range of the Viking spacecraft measurements.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Council for Scientific and Industrial Research, Pretoria (South Africa)
  2. University of the Western Cape, Bellville (South Africa)
  3. Indian Institute of Geomagnetism, New Panvel (W), Navi, Mumbai-410218 (India)
Publication Date:
OSTI Identifier:
22486426
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 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; BOLTZMANN STATISTICS; ELECTRIC FIELDS; ION ACOUSTIC WAVES; IONS; MACH NUMBER; MIDDAY AURORAE; POTENTIALS; PULSES; SOLITONS; SPACE VEHICLES; SUBSONIC FLOW; SUPERSONIC FLOW; TAIL ELECTRONS