Abstract
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.
Highlights
The magnetospheric magnetic field is an essential parameter determining the dynamics of the solar wind–magnetospheric coupling system
Recognizing that future space weather investigations will probably progress towards a higher accuracy within a smaller temporal scale, similar to meteorologic development, this paper focuses on detailed validation of the MHD field model
By presenting the MHD magnetic field model for three fast solar wind Pd enhancement events occurring in 2000 as examples, this paper shows efficiently predicted responses of the total field B and the dominant component Bz at the geosynchronous orbit
Summary
The magnetospheric magnetic field is an essential parameter determining the dynamics of the solar wind–magnetospheric coupling system. The typical time duration of the geosynchronous magnetic field responses are within ∼ 8 min according to GOES measurement These transient events provide a good opportunity to evaluate the immediate responsiveness of the MHD field model. Investigations on some of these processes depend on a reliable and accurate field model Another category of the magnetic field models is the empirical ones based on observation (e.g., the series of Tsyganenko models: Tsyganenko and Stern, 1996; Tsyganenko, 2002, and so on). Unlike the physics-based MHD models which require certain calculation time, the empirical ones can predict the magnetic field almost instantaneously. 3 reports the detailed performance of the MHD magnetic field model after fast solar wind Pd enhancements.
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