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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 8
Ann. Geophys., 30, 1285–1295, 2012
https://doi.org/10.5194/angeo-30-1285-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 1285–1295, 2012
https://doi.org/10.5194/angeo-30-1285-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 27 Aug 2012

Regular paper | 27 Aug 2012

Geosynchronous magnetic field responses to fast solar wind dynamic pressure enhancements: MHD field model

T. R. Sun1,2, C. Wang1, N. L. Borodkova3, and G. N. Zastenker3 T. R. Sun et al.
  • 1State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100080, China
  • 2Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • 3Space Research Institute, Russian Academy of Sciences, Moscow 117997, Russia

Abstract. We performed global MHD simulations of the geosynchronous magnetic field in response to fast solar wind dynamic pressure (Pd) enhancements. Taking three Pd enhancement events in 2000 as examples, we found that the main features of the total field B and the dominant component Bz can be efficiently predicted by the MHD model. The predicted B and Bz varies with local time, with the highest level near noon and a slightly lower level around mid-night. However, it is more challenging to accurately predict the responses of the smaller component at the geosynchronous orbit (i.e., Bx and By). In contrast, the limitations of T01 model in predicting responses to fast Pd enhancements are presented.

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