| A Theoretic Interpretation of Movement of the Cusp Equatorward Boundary |
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| 作者姓名： | A.Leonovich H.Reme I.Dandouras |
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| 作者单位： | [1]Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China [2]China-Russia Joint Research Center on Space Weather, Beijing 100080, China [3]Centre d＇Etude Spatiale des Rayonnements, 31028, Toulouse, France |
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| 基金项目： | Supported by NSFC (No. 40474062)
the China-Russia Joint Research Center on Space Weather,Chinese Academy of Sciences,Key Lab for Space weather, CSSAR |
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| 摘 要： | A preliminary model is proposed to describe quantitatively the position and movement of cusp equatorward boundary. This integrated model, consisting of an empirical model of the magnetopause and a compressed dipolar model of Open/Closed field line, connects quantitatively the solar wind conditions, subsolar magnetopause and cusp equatorward boundary. It is shown that the increasing solar wind dynamic pressure and the increasing southward Interplanetary Magnetic Field (IMF) component drive the magnetopause to move inward and the cusp equatorward. This model is adopted to interpret quantitatively the cusp movement of August 14, 2001 observed by Cluster. The results show that the subsolar magnetopause moved earthward from 10.7 He to 9.0 Re during the period of 002300-002800 UT, and correspondingly the cusp equatorward boundary shifted equatorward. The observations of Cluster C1 and C4 show the cusp equatorward boundary that Cluster Cl and C4 were crossing during same interval moved equatorward by 4.6°. The cusp equatorward boundary velocity computed in the theoretical model (10.7km/s) is in good agreement with the observed value (9.4km/s) calculated from the data of CIS of Cluster C4 and C1.
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| 关 键 词： | 太阳风 赤道 边界线 磁场 |
A Theoretic Interpretation of Movement of the Cusp Equatorward Boundary |
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| A.Leonovich,H.Reme,I.Dandouras.A Theoretic Interpretation of Movement of the Cusp Equatorward Boundary[J].Chinese Journal of Space Science,2005,25(5):412-418. |
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| Authors: | J B Cao A Leonovich GC Zhou ZX Liu H Reme I Dandouras |
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| Abstract: | A preliminary model is proposed to describe quantitatively the position and movement of cusp equatorward boundary. This integrated model, consisting of an empirical model of the magnetopause and a compressed dipolar model of Open/Closed field line, connects quantitatively the solar wind conditions, subsolar magnetopause and cusp equatorward boundary. It is shown that the increasing solar wind dynamic pressure and the increasing southward Interplanetary Magnetic Field (IMF) component drive the magnetopause to move inward and the cusp equatorward. This model is adopted to interpret quantitatively the cusp movement of August 14, 2001 observed by Cluster. The results show that the subsolar magnetopause moved earthward from 10.7 Re to 9.0Re during the period of 002300-002800 UT, and correspondingly the cusp equatorward boundary shifted equatorward. The observations of Cluster C1 and C4 show the cusp equatorward boundary that Cluster C1 and C4 were crossing during same interval moved equatorward by 4.6°. The cusp equatorward boundary velocity computed in the theoretical model (10.7 km/s) is in good agreement with the observed value(9.4km/s) calculated from the data of CIS of Cluster C4 and C1. |
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| Keywords: | Cusp movement Solar Wind Magnetopause |
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