Volume 38 Issue 3
May  2018
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Article Navigation >  Chinese Journal of Space Science  > 2018  >  38(3): 285-295
YANG Zicai, SHEN Fang, YANG Yi, FENG Xueshang. Analysis of Present Research on the WSA Solar Wind Model[J]. Chinese Journal of Space Science, 2018, 38(3): 285-295. doi: 10.11728/cjss2018.03.285
Citation: YANG Zicai, SHEN Fang, YANG Yi, FENG Xueshang. Analysis of Present Research on the WSA Solar Wind Model[J]. Chinese Journal of Space Science, 2018, 38(3): 285-295. doi: 10.11728/cjss2018.03.285
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Analysis of Present Research on the WSA Solar Wind Model

doi: 10.11728/cjss2018.03.285

  • 1 National Space Science Center, Chinese Academy of Sciences, Beijing 100190;

  • 2 University of Chinese Academy of Sciences, Beijing 100049;

  • 3 Institute of Space Science and Applied Technology, Harbin Institute of Technolgy, Shenzhen 518055

  • Received Date: 2017-08-23
  • Rev Recd Date: 2017-12-19
  • Publish Date: 2018-05-15
    Abstract
  • The Wang-Sheeley-Arge (WSA) model is an empirical model that can predict the background solar wind speed and Interplanetary Magnetic Field (IMF) polarity on the Earth. It utilizes the line-of-sight synoptic solar magnetograms as input to give predictions about 3 to 4 days in advance. It is an improved version of the original Wang and Sheeley (WS) model. The relationship was generalized according to the parameters of the Coronal Hole Boundary (DCHB) model. The solar wind velocity is first determined at a certain height by the expansion factor of the magnetic field and the minimum angular distance that an open field footpoint lies from nearest coronal hole boundary. And then a simple 1-D modified kinematic model (1-DMK), which includes an ad hoc method to account for stream interactions, is used to transport the wind from the corona out to the Earth. In the course of development, the WSA model has been improved gradually in the details, such as the source of synoptic magnetograms, the type of coronal magnetic field model, the values of free parameters in velocity relation, the way of mapping the solar wind to earth and so on. Many studies were devoted to improve the prediction accuracy of the WSA model, and it is widely used now in many Magnetohydrodynamic (MHD) solar wind model.

     

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