EFFECT OF ION-NEUTRAL COLLISIONS IN SIMULATIONS OF EMERGING ACTIVE REGIONS

被引:33
作者
Leake, James E. [1 ]
Linton, Mark G. [2 ]
机构
[1] George Mason Univ, Coll Sci, Fairfax, VA 22030 USA
[2] USN, Res Lab, Washington, DC 20375 USA
关键词
magnetic fields; magnetohydrodynamics (MHD); Sun: coronal mass ejections (CMEs); CORONAL MASS EJECTIONS; MAGNETIC-FLUX; ALFVEN WAVES; SOLAR; EMERGENCE; FIELD; CONVECTION; DIFFUSION; MECHANISM; ERUPTION;
D O I
10.1088/0004-637X/764/1/54
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present results of 2.5D numerical simulations of the emergence of sub-surface magnetic flux into the solar atmosphere, with emerging flux regions ranging from 10(18) to 10(21) Mx, representing both ephemeral and active regions. We include the presence of neutral hydrogen in the governing equations, improve upon previous models by including the ionization in the equation of state, and use a more realistic convection zone model. We find that ionization and recombination of plasma during the rise of a convection zone flux tube reduces the rise speed of the tube's axis. The presence of neutral hydrogen allows the effective flow of mass across field lines, by the addition of a Pedersen resistivity to the generalized Ohm's law, which dissipates current perpendicular to the magnetic field. This causes an increase of up to 10% in the amount of magnetic in-plane flux supplied to the corona and a reduction of up to 89% in the amount of sub-surface plasma brought up into the corona. However, it also reduces the amount of free magnetic energy supplied to the corona, and thus does not positively affect the likelihood of creating unstable coronal structures.
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页数:15
相关论文
共 46 条
[1]   INSTABILITY BY MAGNETIC BUOYANCY [J].
ACHESON, DJ .
SOLAR PHYSICS, 1979, 62 (01) :23-50
[2]   A twisted flux rope model for coronal mass ejections and two-ribbon flares [J].
Amari, T ;
Luciani, JF ;
Mikic, Z ;
Linker, J .
ASTROPHYSICAL JOURNAL, 2000, 529 (01) :L49-L52
[3]   A model for solar coronal mass ejections [J].
Antiochos, SK ;
DeVore, CR ;
Klimchuk, JA .
ASTROPHYSICAL JOURNAL, 1999, 510 (01) :485-493
[4]   Emergence of a flux tube through a partially ionized solar atmosphere [J].
Arber, T. D. ;
Haynes, M. ;
Leake, J. E. .
ASTROPHYSICAL JOURNAL, 2007, 666 (01) :541-546
[5]   EFFECT OF SOLAR CHROMOSPHERIC NEUTRALS ON EQUILIBRIUM FIELD STRUCTURES [J].
Arber, T. D. ;
Botha, G. J. J. ;
Brady, C. S. .
ASTROPHYSICAL JOURNAL, 2009, 705 (02) :1183-1188
[6]   A staggered grid, Lagrangian-Eulerian remap code for 3-D MHD simulations [J].
Arber, TD ;
Longbottom, AW ;
Gerrard, CL ;
Milne, AM .
JOURNAL OF COMPUTATIONAL PHYSICS, 2001, 171 (01) :151-181
[7]   Emergence of magnetic flux from the convection zone into the corona [J].
Archontis, V ;
Moreno-Insertis, F ;
Galsgaard, K ;
Hood, AW ;
O'Shea, E .
ASTRONOMY & ASTROPHYSICS, 2004, 426 (03) :1047-1063
[8]   Magnetic flux emergence in the Sun [J].
Archontis, V. .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2008, 113 (A3)
[9]   Eruption of magnetic flux ropes during flux emergence [J].
Archontis, V. ;
Torok, T. .
ASTRONOMY & ASTROPHYSICS, 2008, 492 (02) :L35-L38
[10]   Deep Convection and the Solar Chromosphere [J].
Arkhypov, O. V. ;
Antonov, O. V. ;
Khodachenko, M. L. .
SOLAR PHYSICS, 2012, 278 (02) :285-298