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Electron Bulk Acceleration and Thermalization at Earth's Quasiperpendicular Bow Shock.
Chen, L-J; Wang, S; Wilson, L B; Schwartz, S; Bessho, N; Moore, T; Gershman, D; Giles, B; Malaspina, D; Wilder, F D; Ergun, R E; Hesse, M; Lai, H; Russell, C; Strangeway, R; Torbert, R B; F-Vinas, A; Burch, J; Lee, S; Pollock, C; Dorelli, J; Paterson, W; Ahmadi, N; Goodrich, K; Lavraud, B; Le Contel, O; Khotyaintsev, Yu V; Lindqvist, P-A; Boardsen, S; Wei, H; Le, A; Avanov, L.
Affiliation
  • Chen LJ; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Wang S; Department of Astronomy, University of Maryland, College Park, Maryland 20747, USA.
  • Wilson LB; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Schwartz S; Department of Astronomy, University of Maryland, College Park, Maryland 20747, USA.
  • Bessho N; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Moore T; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80305, USA.
  • Gershman D; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Giles B; Department of Astronomy, University of Maryland, College Park, Maryland 20747, USA.
  • Malaspina D; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Wilder FD; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Ergun RE; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Hesse M; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80305, USA.
  • Lai H; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80305, USA.
  • Russell C; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80305, USA.
  • Strangeway R; University of Bergen, Bergen 5020, Norway.
  • Torbert RB; University of California, Los Angeles, Los Angeles, California 90095, USA.
  • F-Vinas A; University of California, Los Angeles, Los Angeles, California 90095, USA.
  • Burch J; University of California, Los Angeles, Los Angeles, California 90095, USA.
  • Lee S; Southwest Research Institute, San Antonio, Texas 78238, USA.
  • Pollock C; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Dorelli J; Southwest Research Institute, San Antonio, Texas 78238, USA.
  • Paterson W; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Ahmadi N; Denali Scientific, Healy, Alaska 99743, USA.
  • Goodrich K; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Lavraud B; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  • Le Contel O; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80305, USA.
  • Khotyaintsev YV; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80305, USA.
  • Lindqvist PA; Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse (UPS), CNRS, CNES, Toulouse, 31028 Cedex 4, France.
  • Boardsen S; Laboratoire de Physique des Plasmas (UMR7648), CNRS/Ecole Polytechnique/Sorbonne Université/Univ. Paris Sud/Observatoire de Paris, Paris, F91128 Palaiseau Cedex, France.
  • Wei H; Swedish Institute of Space Physics, Uppsala SE-75121, Sweden.
  • Le A; KTH Royal Institute of Technology, Stockholm SE-11428, Sweden.
  • Avanov L; NASA, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
Phys Rev Lett ; 120(22): 225101, 2018 Jun 01.
Article in En | MEDLINE | ID: mdl-29906189
ABSTRACT
Electron heating at Earth's quasiperpendicular bow shock has been surmised to be due to the combined effects of a quasistatic electric potential and scattering through wave-particle interaction. Here we report the observation of electron distribution functions indicating a new electron heating process occurring at the leading edge of the shock front. Incident solar wind electrons are accelerated parallel to the magnetic field toward downstream, reaching an electron-ion relative drift speed exceeding the electron thermal speed. The bulk acceleration is associated with an electric field pulse embedded in a whistler-mode wave. The high electron-ion relative drift is relaxed primarily through a nonlinear current-driven instability. The relaxed distributions contain a beam traveling toward the shock as a remnant of the accelerated electrons. Similar distribution functions prevail throughout the shock transition layer, suggesting that the observed acceleration and thermalization is essential to the cross-shock electron heating.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article Affiliation country:
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Add to My VHL
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article Affiliation country: