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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2004, Volume 79, Issue 8, Pages 452–456
(Mi jetpl2276)
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This article is cited in 23 scientific papers (total in 23 papers)
PLASMA, GASES
Dynamic interaction of plasma flow with the hot boundary layer of a geomagnetic trap
S. P. Savina, L. M. Zelenyia, E. Amatab, J. Buechnerc, J. Bleckid, S. I. Klimova, B. Nikutowskic, J. L. Rauche, S. A. Romanova, A. A. Skalskya, V. N. Smirnova, P. Songf, K. Stasiewiczd a Space Research Institute, Russian Academy of Sciences, Moscow
b Interplanetary Space Phys. Institute, CNR, 00133 Roma, Italy
c Max-Planck Inst. Aeronomie, 37191 Katlenburg-Lindau, Germany
d Space Res. Center, 00716 Warsaw, Poland
e Lab Phys. Chemistry. Environment, 30037 Orleans, France
f University of Massachusetts, 01854 Lowell, USA
Abstract:
The study of the interaction between collisionless plasma flow and stagnant plasma revealed the presence of an outer boundary layer at the border of a geomagnetic trap, where the super-Alfvén subsonic laminar flow changes over to the dynamic regime characterized by the formation of accelerated magnetosonic jets and decelerated Alfvén flows with characteristic relaxation times of 10–20 min. The nonlinear interaction of fluctuations in the initial flow with the waves reflected from an obstacle explains the observed flow chaotization. The Cherenkov resonance of the magnetosonic jet with the fluctuation beats between the boundary layer and the incoming flow is the possible mechanism of its formation. In the flow reference system, the incoming particles are accelerated by the electric fields at the border of boundary layer that arise self-consistently as a result of the preceding wave-particle interactions; the inertial drift of the incoming ions in a transverse electric field increasing toward the border explains quantitatively the observed ion acceleration. The magnetosonic jets may carry away downstream up to a half of the unperturbed flow momentum, and their dynamic pressure is an order of magnitude higher than the magnetic pressure at the obstacle border. The appearance of nonequilibrium jets and the boundary-layer fluctuations are synchronized by the magnetosonic oscillations of the incoming flow at frequencies of 1–2 mHz.
Received: 02.03.2004
Citation:
S. P. Savin, L. M. Zelenyi, E. Amata, J. Buechner, J. Blecki, S. I. Klimov, B. Nikutowski, J. L. Rauch, S. A. Romanov, A. A. Skalsky, V. N. Smirnov, P. Song, K. Stasiewicz, “Dynamic interaction of plasma flow with the hot boundary layer of a geomagnetic trap”, Pis'ma v Zh. Èksper. Teoret. Fiz., 79:8 (2004), 452–456; JETP Letters, 79:8 (2004), 368–371
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https://www.mathnet.ru/eng/jetpl2276 https://www.mathnet.ru/eng/jetpl/v79/i8/p452
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Abstract page: | 333 | Full-text PDF : | 76 | References: | 45 |
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