Interhemispheric Comparison of Dipole Tilt Angle Effects on Latitude of Mid-Altitude Cusp
GUO Jian-Guang1,2, SHI Jian-Kui1, ZHANG Tie-Long3, LIU Zhen-Xing1
1State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 1000802Graduate University of Chinese Academy of Sciences, Beijing 1000493Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Interhemispheric Comparison of Dipole Tilt Angle Effects on Latitude of Mid-Altitude Cusp
1State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 1000802Graduate University of Chinese Academy of Sciences, Beijing 1000493Space Research Institute, Austrian Academy of Sciences, Graz, Austria
摘要A statistical study of interhemispheric comparison of dipole tilt angle effect on the latitude of the mid-altitude cusp is preformed by a data set of the Cluster cusp crossings over a 5-year period. The result shows that the dipole tilt angle has a clear control of the cusp latitudinal location. When the dipole tilts sunwards, the cusp is shifted poleward. The northern cusp moves 1° ILAT for every 15.4° increase in the dipole tilt angle, while the southern cusp moves 1° ILAT for every 20.8° increase in the dipole tilt angle. This suggests that an interhemispheric difference appears in the dependence of cusp latitudinal location on the dipole tilt angle.
Abstract：A statistical study of interhemispheric comparison of dipole tilt angle effect on the latitude of the mid-altitude cusp is preformed by a data set of the Cluster cusp crossings over a 5-year period. The result shows that the dipole tilt angle has a clear control of the cusp latitudinal location. When the dipole tilts sunwards, the cusp is shifted poleward. The northern cusp moves 1° ILAT for every 15.4° increase in the dipole tilt angle, while the southern cusp moves 1° ILAT for every 20.8° increase in the dipole tilt angle. This suggests that an interhemispheric difference appears in the dependence of cusp latitudinal location on the dipole tilt angle.
GUO Jian-Guang;SHI Jian-Kui;ZHANG Tie-Long;LIU Zhen-Xing. Interhemispheric Comparison of Dipole Tilt Angle Effects on Latitude of Mid-Altitude Cusp[J]. 中国物理快报, 2008, 25(5): 1916-1918.
GUO Jian-Guang, SHI Jian-Kui, ZHANG Tie-Long, LIU Zhen-Xing. Interhemispheric Comparison of Dipole Tilt Angle Effects on Latitude of Mid-Altitude Cusp. Chin. Phys. Lett., 2008, 25(5): 1916-1918.
[1] Smith M F and Lockwood M 1996 Rev. Geophys. 34 233 [2] Heikkila W J and Winningham J D 1971 J. Geophys.Res. 76 883 [3] Frank L A 1971 J. Geophys. Res. 76 5202 [4] Choe J Y, Beard D B and Sullivan E C 1973 PlanetSpace Sci. 21 485 [5] Choe J Y and Beard D B 1974 Planet Space Sci. 22 595 [6] Burch J L 1972 J. Geophys. Res. 77 6696 [7] Newell P T and Meng C I 1989 J. Geophys. Res. 94 6949 [8] N\u{eme\v{cek Z, Merka J and Safr\v{ankov\v{a 2000 Geophys. Res. Lett. 27 77 [9] Zhou X-W, Russell C T, Le G et al 1999 Geophys. Res.Lett. 26 429 [10] Pitout F, Escoubet C P, Klecker B et al 2006 Ann.Geophys. 24 3011 [11] Palmroth M, Laakso H and Pulkkinen 2001 J. Geophys.Res. 106 21109 [12]Tsyganenko N A and Stern D P 1996 J. Geophys. Res. 101 27187 [13] Fujii R, T A Potemra, and M. Sugiura 1981 Geophys.Res. Lett. 8 1103 [14] Christiansen F, V O Papitashvili and T Neubert 2002 J. Geophys. Res. 107 (A2) 1029 [15] Ohtani S, Ueno G and Higuchi T et al 2005 J.Geophys. Res. 110 A01216
2008, Vol. 25 
