Strong space plasma magnetic barriers and Alfvénic collapse |
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| Authors: | E A Kuznetsov S P Savin E Amata M Dunlop Y Khotyaintsev L M Zelenyi E V Panov J Büchner S A Romanov J Blecki J L Rauch B Nikutowski |
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| Institution: | (1) Landau Institute for Theoretical Physics, Russian Academy of Sciences, Moscow, 119334, Russia;(2) Space Research Institute, Russian Academy of Sciences, Moscow, 117997, Russia;(3) Istituto di Fisica dello Spazio Interplanetario, INAF, 00133 Roma, Italy;(4) Space Science and Technology Department, Rutherford Appleton Laboratory, Chilton, OX110QX, UK;(5) Swedish Institute of Space Physics, 75121 Uppsala, Sweden;(6) Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany;(7) Space Research Center, Polish Academy of Sciences, Warsaw, 00716, Poland;(8) Laboratoire de Physique et Chimie, de l’Environnement, CNRS, Orleans, 45071, France |
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| Abstract: | High-magnitude magnetic barriers in space and solar plasma are proposed to be attributed to the pile up of magnetic field
lines and their Alfvénic collapse for MHD flows. The analysis of experimental data from both the Interball and Cluster spacecrafts
shows that high-magnitude magnetic structures found in the Earth magnetosheath and near the magnetopause are supported by
a nearly thermal transverse plasma flow, with the minimum barrier width being on the order of the ion gyroradius. The collapse
termination at such scales can be explained by the balance between the pile up of magnetic field lines and backward finite-gyroradius
diffusion. Comparison between the theoretical, modeling, and experimental data shows that the Alfvénic collapse is, in general,
a promising mechanism for magnetic field generation and plasma separation.
The text was submitted by the authors in English. |
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