[1] Siscoe G L and Siebert K D 2006 J. Atmospheric and
Solar--Terrestrial Phys. 106 911

[2] Liang J and Liu W W 2007 J. Geophys. Res. 112
A09208 doi:10.1029/2007JA012303

[3] Ogino T 1986 J. Geophys. Res. 91 6791

[4] Fedder J A and Lyon J G 1987 Geophys. Res. Lett.
14 880

[5] Raeder J, Walker R J and Ashour-Adballa M 1995
Geophys. Res. Lett. 22 349

[6] Tanaka T 1995 J. Geophys. Res. 100 12057

[7] Janhulen P and Koskinen H E J 1997 Geophys. Res.
Lett. 24 1419

[8] Siscoe G L, Crooker N U, Erickson G M et al 2000
Global Geometry of Magnetospheric Currents Inferred from MHD
Simulations, in Magnetospheric Current Systems ed Ohtani S et al
(Washington, DC: American Geophysical Union) p 41

[9] Fedder J A, Slinker S P, Lyon J G et al 1997 Geophys.
Res. Lett. 24 2491

[10] Siebert K D and Siscoe G L 2002 J. Geophys. Res.
107 1095 doi:10.1029/2001JA000237

[11] Guo X C, Wang C, Hu Y Q and Kan J R 2008 Geophys.
Res. Lett. 35 L03108 doi:10.1029/2007GL032713

[12] Lopez R E, Wiltberger M, Hernandez S and Lyon J G 2004
Geophys. Res. Lett. 31 L08804 doi:10.1029/2003GL018780

[13] Kataoka R, Fairfield D H, Sibeck D G et al. 2005
Geophys. Res. Lett. 32 L21108 doi:10.1029/2005GL024495

[14] Ridley A J 2005 Annales Geophys. 23 3533

[15] Ridley A J 2007 Annales Geophys. 25 533

[16] Hu Y Q, Guo X C, Li G Q et al 2005 Chin. Phys.
Lett. 22 2723

[17] Hu Y Q, Guo X C and Wang C 2007 J. Geophys. Res.
112 A07215 doi:10.1029/2006JA012145

[18] Colella P and Woodward P R 1984 J. Comput. Phys.
54 174

[19] Roberge W and Draine B 1990 Astrophysical J.
350 700

[20] Siscoe G L, Erickson G M, Sonnerup B U \"O et al 2002
J. Geophys. Res. 107 1075 doi:10.1029/2001JA000109