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Titolo:
Global hybrid simulation of the dayside reconnection layer and associated field-aligned currents
Autore:
Lin, Y;
Indirizzi:
Auburn Univ, Dept Phys, Allison Lab 206, Auburn, AL 36849 USA Auburn UnivAuburn AL USA 36849 ys, Allison Lab 206, Auburn, AL 36849 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A11, volume: 106, anno: 2001,
pagine: 25451 - 25465
SICI:
0148-0227(20011101)106:A11<25451:GHSOTD>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERPLANETARY MAGNETIC-FIELD; LOW-LATITUDE RECONNECTION; FLUX-TRANSFER EVENTS; ROTATIONAL DISCONTINUITIES; ALFVEN WAVES; EARTHS MAGNETOPAUSE; SOLAR-WIND; CUSP OBSERVATIONS; NORTHWARD IMF; GENERATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Lin, Y Auburn Univ, Dept Phys, Allison Lab 206, Auburn, AL 36849 USA Auburn Univ Auburn AL USA 36849 ison Lab 206, Auburn, AL 36849 USA
Citazione:
Y. Lin, "Global hybrid simulation of the dayside reconnection layer and associated field-aligned currents", J GEO R-S P, 106(A11), 2001, pp. 25451-25465

Abstract

A two-dimensional global hybrid simulation is carried out to study the structure of the magnetopause boundary layer in the noon-midnight meridian plane associated with the dayside reconnection. In the simulation the bow shock, magnetosheath, and magnetopause are formed self-consistently by supersonic solar wind passing the geomagnetic field. The dayside reconnection is triggered by imposing a current-dependent resistivity at the subsolar magnetopause. A large-amplitude rotational discontinuity is formed in the quasi-steady reconnection layer in the northern and southern hemispheres. The rotational discontinuity possesses an electron sense, or right-hand polarizationin the magnetic field as the discontinuity is formed from the X line, and the magnetic structures in the magnetopause northward and southward of the X line are asymmetric in the cases with a nonzero B-y component of the interplanetary magnetic field (IMF). However, later the rotational discontinuity tends to evolve to a structure with a smallest field rotational angle andthus may reverse its sense of the field rotation. The Walen relation is tested for electron and ion flows in the magnetopause rotational discontinuities with left-hand and right-hand polarizations. Field-aligned currents aregenerated in the magnetopause rotational discontinuity during the reconnection, and nearly 5% of the magnetopause currents propagate with Alfven waves along the field lines into the polar ionosphere. In addition, a weak secondary rotational discontinuity or Alfven wave pulse propagates from the reconnection site into the magnetosphere. The sense of the field-aligned currents is investigated for various values of the IMF B-y. The Hall effects on the structure of the magnetopause boundary layer and the field-aligned currents are discussed.

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Documento generato il 11/07/20 alle ore 16:59:56