3D reconnection due to oblique modes: a simulation of Harris current sheets
| Autor: | Giovanni Lapenta, J. U. Brackbill |
|---|---|
| Přispěvatelé: | EGU, Publication, Istituto Nazionale per la Fisica della Materia and Dipartimento di Energetica, Politecnico di Torino = Polytechnic of Turin (Polito), Los Alamos National Laboratory (LANL) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph] 01 natural sciences Instability 010305 fluids & plasmas [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Current sheet Physics::Plasma Physics 0103 physical sciences Tearing lcsh:Science 0105 earth and related environmental sciences Physics [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] lcsh:QC801-809 Oblique case Magnetic reconnection Mechanics Linear stage Dissipation lcsh:QC1-999 Magnetic field lcsh:Geophysics. Cosmic physics Classical mechanics [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Physics::Space Physics [SDU.STU] Sciences of the Universe [physics]/Earth Sciences lcsh:Q lcsh:Physics |
| Zdroj: | Nonlinear Processes in Geophysics, Vol 7, Iss 3/4, Pp 151-158 (2000) Nonlinear Processes in Geophysics Nonlinear Processes in Geophysics, European Geosciences Union (EGU), 2000, 7 (3/4), pp.151-158 Scopus-Elsevier |
| ISSN: | 1607-7946 1023-5809 |
| Popis: | International audience; Simulations in three dimensions of a Harris current sheet with mass ratio, mi/me = 180, and current sheet thickness, pi/L = 0.5, suggest the existence of a linearly unstable oblique mode, which is independent from either the drift-kink or the tearing instability. The new oblique mode causes reconnection independently from the tearing mode. During the initial linear stage, the system is unstable to the tearing mode and the drift kink mode, with growth rates that are accurately described by existing linear theories. How-ever, oblique modes are also linearly unstable, but with smaller growth rates than either the tearing or the drift-kink mode. The non-linear stage is first reached by the drift-kink mode, which alters the initial equilibrium and leads to a change in the growth rates of the tearing and oblique modes. In the non-linear stage, the resulting changes in magnetic topology are incompatible with a pure tearing mode. The oblique mode is shown to introduce a helical structure into the magnetic field lines. |
| Databáze: | OpenAIRE |
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