EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Modeling of the Subsolar Magnetopause Motion Under Interplanetary Magnetic Field Southward Turning

Qiuyu Xu1,2, BinBin Tang1, Tianran Sun1, Xiaoxin Zhang3, Fei Wei1, Xiaocheng Guo1, and Chi Wang1
Qiuyu Xu et al.
  • 1National Space Science Center, Chinese Academy of Sciences, Beijing, China
  • 2University of Chinese Academy of Sciences, Beijing, China
  • 3Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing, China

In this study, a new analytical model to describe the time-dependent subsolar magnetopause motion under interplanetary magnetic field (IMF) southward turning has been developed. This model, based on the scenario of magnetopause erosion due to magnetic reconnection, can be approximated by both linear and non-linear functions. The linear function is simplified under the assumption of constant magnetopause erosion under southward IMF, and the non-linear function is derived by assuming that the magnetopause erosion decays exponentially. In the limit of a short time, the non-linear function is essentially the same as the linear function. By comparing with global MHD simulations, the linear function performs well within the first ten minutes, and the error then increases with time. The non-linear function describes the magnetopause motion more accurately with respect to, and consistent with simulations for a time interval of $\sim 40$ minutes. This model has also been successfully applied to data-driven simulations of the 17 March 2015 geomagnetic storm event, suggesting the possible applicability of this model in reality. 

How to cite: Xu, Q., Tang, B., Sun, T., Zhang, X., Wei, F., Guo, X., and Wang, C.: Modeling of the Subsolar Magnetopause Motion Under Interplanetary Magnetic Field Southward Turning, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-10542,, 2023.