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Title: The link between shocks, turbulence, and magnetic reconnection in collisionless plasmas

Global hybrid (electron fluid, kinetic ions) and fully kinetic simulations of the magnetosphere have been used to show surprising interconnection between shocks, turbulence, and magnetic reconnection. In particular, collisionless shocks with their reflected ions that can get upstream before retransmission can generate previously unforeseen phenomena in the post shocked flows: (i) formation of reconnecting current sheets and magnetic islands with sizes up to tens of ion inertial length. (ii) Generation of large scale low frequency electromagnetic waves that are compressed and amplified as they cross the shock. These “wavefronts” maintain their integrity for tens of ion cyclotron times but eventually disrupt and dissipate their energy. (iii) Rippling of the shock front, which can in turn lead to formation of fast collimated jets extending to hundreds of ion inertial lengths downstream of the shock. The jets, which have high dynamical pressure, “stir” the downstream region, creating large scale disturbances such as vortices, sunward flows, and can trigger flux ropes along the magnetopause. This phenomenology closes the loop between shocks, turbulence, and magnetic reconnection in ways previously unrealized. These interconnections appear generic for the collisionless plasmas typical of space and are expected even at planar shocks, although they will also occur atmore » curved shocks as occur at planets or around ejecta.« less
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [2] ;  [7] ;  [8] ;  [9] ;  [10] ; ;  [11] ;  [12] ;  [13]
  1. University of California, San Diego, La Jolla, California 92093 (United States)
  2. (United States)
  3. SciberQuest, Inc., Del Mar, California 92014 (United States)
  4. University of Iowa, Iowa City, Iowa 52242 (United States)
  5. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  6. Aalto University, Espoo (Finland)
  7. Embry Riddle Aeronautical University, Florida 32114 (United States)
  8. (Finland)
  9. University of Delaware, Newark, Delaware 19716 (United States)
  10. NASA Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States)
  11. San Diego Supercomputer Center, La Jolla, California 92093 (United States)
  12. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  13. Kitware, New York 12065 (United States)
Publication Date:
OSTI Identifier:
22300271
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 6; 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; COLLISIONLESS PLASMA; ELECTROMAGNETIC RADIATION; ELECTRONS; MAGNETIC ISLANDS; MAGNETIC RECONNECTION; MAGNETOPAUSE; SIMULATION; TURBULENCE