천문학회지 (Journal of The Korean Astronomical Society)

  • 제46권6호
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  • Pages.261-268
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  • 2013
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  • 1225-4614(pISSN)
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  • 2288-890X(eISSN)
한국천문학회 (The Korean Astronomical Society)
권호 표지
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MAGNETIC FLUX-CURRENT SURFACES OF MAGNETOHYDROSTATIC EQUILIBRIA

  • Choe, G.S. (School of Space Research, Kyung Hee University) ;
  • Jang, Minhwan (Department of Astronomy and Space Science, Kyung Hee University)
  • 투고 : 2013.12.02
  • 심사 : 2013.12.08
  • 발행 : 2013.12.31
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초록

Magnetohydrostatic equilibria, in which the Lorentz force, the plasma pressure force and the gravitational force balance out to zero, are widely adopted as the zeroth order states of many astrophysical plasma structures. A magnetic flux-current surface is a surface, in which both magnetic field lines and current lines lie. We for the first time derive the necessary and sufficient condition for existence of magnetic flux-current surfaces in magnetohydrostatic equilibria. It is also shown that the existence of flux-current surfaces is a necessary (but not sufficient) condition for the ratio of gravity-aligned components of current density and magnetic field to be constant along each field line. However, its necessary and sufficient condition is found to be very restrictive. This finding gives a significant constraint in modeling solar coronal magnetic fields as force-free fields using photospheric magnetic field observations.

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참고문헌

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