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Titolo:
Hall effects on the generation of field-aligned currents in three-dimensional magnetic reconnection
Autore:
Ma, ZW; Lee, LC;
Indirizzi:
Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA Univ Iowa Iowa City IA USA 52242 t Phys & Astron, Iowa City, IA 52242 USA Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 Dept Phys, Tainan 70101, Taiwan
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A11, volume: 106, anno: 2001,
pagine: 25951 - 25960
SICI:
0148-0227(20011101)106:A11<25951:HEOTGO>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLUX-TRANSFER EVENTS; MAGNETOTAIL RECONNECTION; HYDROMAGNETIC-WAVES; SUDDEN ENHANCEMENT; MHD SIMULATIONS; CURRENT SHEETS; ALFVEN WAVES; 3 DIMENSIONS; MAGNETOPAUSE; PLASMAS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Ma, ZW Univ Iowa, Dept Phys & Astron, 203 Van Allen Hall, Iowa City, IA 52242 USA Univ Iowa 203 Van Allen Hall Iowa City IA USA 52242 y, IA 52242 USA
Citazione:
Z.W. Ma e L.C. Lee, "Hall effects on the generation of field-aligned currents in three-dimensional magnetic reconnection", J GEO R-S P, 106(A11), 2001, pp. 25951-25960

Abstract

A three-dimensional Hall MHD simulation is carried out to study the Hall effects on the generation of field-aligned currents (FAC) and Alfven waves by magnetic reconnection. The magnetic field is initially set up with an antiparallel component, (B-z) with respect to the plane x = 0. The initial current flows in the y direction. Several interesting features emerge owing tothe inclusion of the Hall term in the MHD equation. In Hall MHD, the magnetic field lines are frozen in the electron fluid, but not in the ion fluid. In the presence of a Hall term, a strong electron velocity in the -y direction is usually present in the region with a high current density J in the y direction. As a result, the reconnected magnetic field lines are bent andalso shifted in the -y direction. Generated FACs break the dawn-dusk symmetry, and the region of generated FACs tends to shift, to the side with y < 0. The magnitude of generated FACs increases with increasing ion inertial length. We use the Walen relation to examine the presence of Alfven waves. The ion and electron Walen ratios are defined as A(i) equivalent to Omega (iparallel to)/Omega (A parallel to) and A(e) equivalent to Omega (e parallel to)/Omega (A parallel to), respectively. Here, Omega (i parallel to), Omega (e parallel to), and Omega (A parallel to) are the ion, electron, and Alfven parallel vorticities, respectively. The ion and electron Walen relations are found to be different. It is also found that in the region J(parallel to) < 0, Alfven waves have a right-hand polarization with A(i) < 1, whilein the region J(parallel to) > 0, Alfven waves have a left-hand polarization with A(i) > 1.

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Documento generato il 01/04/20 alle ore 21:03:25