Volume 35 Issue 6
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Han Jinpeng, Li Hui, Tang Binbin, Wang Chi. Invariant Modulation of IMF Clock Angle on the Solar Wind Energy Input into the Magnetosphere[J]. Chinese Journal of Space Science, 2015, 35(6): 673-678. doi: 10.11728/cjss2015.06.673
Citation: Han Jinpeng, Li Hui, Tang Binbin, Wang Chi. Invariant Modulation of IMF Clock Angle on the Solar Wind Energy Input into the Magnetosphere[J]. Chinese Journal of Space Science, 2015, 35(6): 673-678. doi: 10.11728/cjss2015.06.673
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Invariant Modulation of IMF Clock Angle on the Solar Wind Energy Input into the Magnetosphere

doi: 10.11728/cjss2015.06.673
  • 1.

    State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190

  • 2.

    College of Earth Science, University of the Chinese Academy of Sciences, Beijing 100049

  • 3.

    Research and Development Center, China Academy of Launch Vehicle Technology, Beijing 100076

Funds:  Supported by the National Basic Research Program (2012CB825602), National Natural Science Foundation of China (NNSFC, 41204118, 41231067), and in part by the Specialized Research Fund for State Key Laboratories of China.
More Information
  • Corresponding author: Han Jinpeng,E-mail:hanjinpeng520@126.com
  • Received Date: 2015-01-23
  • Rev Recd Date: 2015-05-18
  • Publish Date: 2015-11-15
    Abstract
  • By use of the global PPMLR Magnetohydrodynamics (MHD) model, a serial of quasisteady- state numerical simulations were conducted to examine the modulation property of the interplanetary magnetic field clock angle θ on the solar wind energy input into the magnetosphere. All the simulations can be divided into seven groups according to different criteria of solar wind conditions. For each group, 37 numerical examples are analyzed, with the clock angle varying from 0° to 360° with an interval of 10°, keeping the other solar wind parameters (such as the solar wind number density, velocity, and the magnetic field magnitude) unchanged. As expected, the solar wind energy input into the magnetosphere is modulated by the IMF clock angle. The axisymmetrical bell-shaped curve peaks at the clock angle of 180°. However, the modulation effect remains invariant with varying other solar wind conditions. The function form of such an invariant modulation is found to be sin(θ/2)2.70 + 0.25.

     

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