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The determination of the varying position and shape of magnetopause is one of the important Gordian knots in geophysics and space physics. According to the solar wind-magnetosphere-ionosphere coupling global magnetohydrodynamic (MHD) simulation, and with the maximum electric current criterion, we study the position and shape of the magnetopause under several solar wind dynamic pressure (Dp) and interplanetary magnetic field conditions. The simulation results show that the subsolar position (r0) of the magnetopause is controlled mainly by Dp with the significant decrease of r0 as Dp increases. At a certain Dp, when southword Bz (Bz0) decreases to zero, then shifts to northward (Bz0) and increases, the subsolar position r0 keeps increasing. For all cases studie here, the flare angle () of the magnetopause experiences small changes. This provide an evidence for the structural self-similarity of magnetopause in equatorial plane. Compared with the empirical low-latitude magnetopause model of Shue98, MHD simulation can reproduce the dependence of the subsolar point r0 on Dp, while the saturation effect of r0 varying with Bz in empirical model is represented only with slow solar wind. As to the flare angle , although the difference between MHD simulation and empirical model is less than 2.5, the variation of with Bz in MHD simulations is nonlinear and different from the linear trend in empirical model.
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Keywords:
- equatorial magnetopause /
- location and shape /
- MHD simulation
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[5] Lü J Y, Wang J S 2010 Space Weather (Beijing: Meteorology Press) (in Chinese) [吕建永, 王劲松 2010 空间天气学 (北京: 气象出版社)]
[6] Lü J Y, Yang Y F, Du D 2011 Adv. Met Sci. Tech. 1 26 (in Chinese) [吕建永, 杨亚芬, 杜丹 2011 气象科技进展 1 26]
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[9] Lü J Y, Liu Z Q , Kabin K 2011 J. Geophys. Res. 116 A09237
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[14] Shue J H, Chao J, Fu H C 1997 J. Geophys. Res. 102 9497
[15] Shue J H, Song P, Russell C T 1998 J. Geophys. Res. 103 17691
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[17] Kalegaev V V, Lyutov Y G 2000 Adv. Space Res. 25 1489
[18] Lin R L, Zhang X X, Liu S Q, Wang Y L, Gong J C 2010 J. Geophys. Res. 115 A04207
[19] Wang C 2011 Chin. J. Space Sci. 31 413 (in Chinese) [王赤 2011 空间科学学报 31 413]
[20] Tóth G, Sokolv I V, Gombosi T I 20052007 J. Geophys. Res. 110 A12226
[21] Hu Y Q, Guo X C, Wang C 2005 Chin. Phys. Lett. 22 2273
[22] Hu Y Q, Guo X C, Wang C 2007 J. Geophys. Res. 112 7215
[23] Wang C, Li C X, Huang Z H 2006 Geophys. Res. Lett. 33 14104
[24] Wang C, Liu J B, Huang Z H, Richardson J D 2007 J. Geophys. Res. 112 A12210
[25] Huang Z H, Wang C, Hu Y Q, Guo X C 2008 Comput. Math. Appl. 55 1094
[26] Matsumoto H, Omura Y 1993 Computer Space Plasma Physics (Tokyo: Terra Scientific Publishing Company)
[27] Wang C, Li H, Guo X C, Ding K, Huang Z H 2012 Sci. China Earth Sci. 55 1037
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[1] Stern D P 1989 Rev. Geophys. 27 103
[2] Tu C Y 1988 Solar Terrestrial Physics (Beijing: Science Press) (in Chinese) [涂传诒 1988 日地空间物理学(下册) (北京: 科学出版社)]
[3] Bothmer V, Daglis I A 2007 Space Weather—Physics and Effects (Berlin: Springer-Verlag)
[4] Wang S, Wei F S 2007 Prog. Geophys. 22 1025 (in Chinese) [王水, 魏奉思 2007 地球物理学进展 22 1025]
[5] Lü J Y, Wang J S 2010 Space Weather (Beijing: Meteorology Press) (in Chinese) [吕建永, 王劲松 2010 空间天气学 (北京: 气象出版社)]
[6] Lü J Y, Yang Y F, Du D 2011 Adv. Met Sci. Tech. 1 26 (in Chinese) [吕建永, 杨亚芬, 杜丹 2011 气象科技进展 1 26]
[7] Sotirelis T, Meng C I 1999 Geophys. Res. 104 6889
[8] Fairfield D H 1971 J. Geophys. Res. 76 6700
[9] Lü J Y, Liu Z Q , Kabin K 2011 J. Geophys. Res. 116 A09237
[10] Liu H L, Huang Z H 2011 Chin. J. Space Sci. 31 15 (in Chinese) [刘惠莲, 黄朝晖 2011 空间科学学报 31 15]
[11] Roelof E C, Sibeck D G 1993 J. Geophys. Res. 98 421
[12] Kawano H, Petrinc S M, Russell C T, Higuchi T 1999 J. Geophys. Res. 104 247
[13] Petrinec S M, Russell C T 1996 J. Geophys. Res. 101 137
[14] Shue J H, Chao J, Fu H C 1997 J. Geophys. Res. 102 9497
[15] Shue J H, Song P, Russell C T 1998 J. Geophys. Res. 103 17691
[16] Boardsen S A, Eastman T E, Sotierlis T, Green J L 2000 J. Geophys. Res. 23 193
[17] Kalegaev V V, Lyutov Y G 2000 Adv. Space Res. 25 1489
[18] Lin R L, Zhang X X, Liu S Q, Wang Y L, Gong J C 2010 J. Geophys. Res. 115 A04207
[19] Wang C 2011 Chin. J. Space Sci. 31 413 (in Chinese) [王赤 2011 空间科学学报 31 413]
[20] Tóth G, Sokolv I V, Gombosi T I 20052007 J. Geophys. Res. 110 A12226
[21] Hu Y Q, Guo X C, Wang C 2005 Chin. Phys. Lett. 22 2273
[22] Hu Y Q, Guo X C, Wang C 2007 J. Geophys. Res. 112 7215
[23] Wang C, Li C X, Huang Z H 2006 Geophys. Res. Lett. 33 14104
[24] Wang C, Liu J B, Huang Z H, Richardson J D 2007 J. Geophys. Res. 112 A12210
[25] Huang Z H, Wang C, Hu Y Q, Guo X C 2008 Comput. Math. Appl. 55 1094
[26] Matsumoto H, Omura Y 1993 Computer Space Plasma Physics (Tokyo: Terra Scientific Publishing Company)
[27] Wang C, Li H, Guo X C, Ding K, Huang Z H 2012 Sci. China Earth Sci. 55 1037
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