Journal ArticleDOI
Selected problems in collisionless-shock physics
Bertrand Lembège,Joe Giacalone,Manfred Scholer,Tohru Hada,Masahiro Hoshino,Vladimir Krasnoselskikh,Harald Kucharek,Philippe Savoini,Toshio Terasawa +8 more
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TLDR
In this article, the authors address a subset of unresolved problems in collisionless shock physics from a theoretical and/or numerical modeling point of view, including the nonstationarity of the shock front, the heating and dynamics of electrons through the shock layer, particle diffusion in turbulent electric and magnetic fields, particle acceleration, and the interaction of pickup ions with collisionless shocks.Abstract:
The physics of collisionless shocks is a very broad topic, which has been well studied for many decades. However, there are a number of important issues which remain unresolved. Moreover, there have been new findings, which cast doubt on well-established ideas. The purpose of this review is to address a subset of unresolved problems in collisionless shock physics from a theoretical and/or numerical modeling point of view. The topics which are addressed are: the nonstationarity of the shock front, the heating and dynamics of electrons through the shock layer, particle diffusion in turbulent electric and magnetic fields, particle acceleration, and the interaction of pickup ions with collisionless shocks.read more
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The microphysics of collisionless shock waves
Alexandre Marcowith,Antoine Bret,A. M. Bykov,M. E. Dieckman,L. O'c. Drury,B. Lembege,Martin Lemoine,G. Morlino,G. C. Murphy,G. Pelletier,Illya Plotnikov,Brian Reville,Mario Riquelme,Lorenzo Sironi,A. Stockem Novo +14 more
TL;DR: This review adresses the physics of shock formation, shock dynamics and particle acceleration based on a close examination of available multi-wavelength or in situ observations, analytical and numerical developments and focuses on the different instabilities triggered during the shock formation and in association with particle acceleration processes.
Journal ArticleDOI
Magnetic fields at the solar wind termination shock
L. F. Burlaga,N. F. Ness,Mario H. Acuña,R. P. Lepping,John E. P. Connerney,John D. Richardson +5 more
TL;DR: Observations of the magnetic field structure and dynamics of the termination shock made by Voyager 2 on 31 August–1 September 2007 reveal a complex, rippled, quasi-perpendicular supercritical magnetohydrodynamic shock of moderate strength undergoing reformation on a scale of a few hours.
Journal ArticleDOI
The microphysics of collisionless shock waves
A. Marcowith,Antoine Bret,A. M. Bykov,M. E. Dieckman,L. O. C. Drury,B. Lembege,Martin Lemoine,G. Morlino,G. C. Murphy,G. Pelletier,Illya Plotnikov,Brian Reville,Mario Riquelme,Lorenzo Sironi,A. Stockem Novo +14 more
TL;DR: In this paper, a review of the physics of collisionless shock microphysics is presented, focusing on the different instabilities triggered during the shock formation and in association with particle acceleration processes with regards to the properties of the background upstream medium.
Journal ArticleDOI
Quasi-parallel Shock Structure and Processes
David Burgess,E. A. Lucek,Manfred Scholer,Stuart D. Bale,Michael A. Balikhin,André Balogh,Timothy S. Horbury,Vladimir Krasnoselskikh,Harald Kucharek,Bertrand Lembège,Eberhard Möbius,Steven J. Schwartz,Steven J. Schwartz,Michelle F. Thomsen,Simon Walker +14 more
TL;DR: The supercritical quasi-parallel shock is a spatially extended and inhomogeneous transition, with smaller length-scale features cyclically reforming within it as discussed by the authors, which makes interpreting single spacecraft data more Diffcult.
Journal ArticleDOI
Kinetic-gasdynamic modeling of the heliospheric interface
Vlad Izmodenov,Vlad Izmodenov,Y. G. Malama,Y. G. Malama,Michael S. Ruderman,Michael S. Ruderman,S. V. Chalov,S. V. Chalov,Dmitry Alexashov,Dmitry Alexashov,Olga Katushkina,Olga Katushkina,E. A. Provornikova,E. A. Provornikova +13 more
TL;DR: Baranov et al. as discussed by the authors presented a self-consistent, two-component, kinetic-gasdynamic model with pickup protons as a separate non-equilibrium component.
References
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The acceleration of cosmic rays in shock fronts – I
Journal ArticleDOI
Particle Acceleration by Astrophysical Shocks
TL;DR: In this article, a new mechanism is proposed for acceleration of a power-law distribution of cosmic rays with approximately the observed slope, where high-energy particles in the vicinity of a shock are scattered by Alfven waves carried by the converging fluid flow leading to a first-order acceleration process in which the escape time is automatically comparable to the acceleration time.
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The passage of energetic charged particles through interplanetary space
TL;DR: In this article, a general expression for the particle diffusion coefficient kij, including both scattering in magnetic irregularities and systematic pressure drifts, was derived from the condition that energetic solar particles in interplanetary space random walk in the irregularities in the large-scale inter-planetary magnetic field, and the observed fields show that the diffusion coefficient is of the order of 1021-1022 cm2/sec.