This module is licensed under a CC BY-NC-SA 4.0 License.

Since the server of http:https://staff.ustc.edu.cn/~rliu/qfactor.html will stop, those codes will be updated on this site from July 2022.

A GPU version is also provided https://github.com/peijin94/FastQSL.

• IDL https://www.l3harrisgeospatial.com/Software-Technology/IDL or
• GDL https://gnudatalanguage.github.io
  • note: setting an environmental variable of GDL_PATH is necessary for write_png. If you used one of the binary packages available for Linux then it depends on the distribution:
    -Ubuntu & Fedora: /usr/share/gnudatalanguage/lib
    -ArchLinux: /usr/lib/gdl
    -Gentoo: /usr/local/share/gdl
    -MacOS: /opt/local/share/gnudatalanguage/lib
    Please append such line to ~/.bashrc (for Ubuntu)
    export GDL_PATH=/usr/share/gnudatalanguage/lib

• gfortran https://gcc.gnu.org/wiki/GFortran or
• ifort https://www.intel.com/content/www/us/en/developer/articles/tool/oneapi-standalone-components.html#fortran
  • note: please append this line to ~/.bashrc
    source /opt/intel/oneapi/setvars.sh intel64

Please see the beginning of qfactor.pro

• Demos (the compilation described at the beginning of qfactor.pro should be done first):

IDL> .r demo_charge4.pro

• Zhang, P., Chen, J.*, Liu, R. and Wang, C., FastQSL: A Fast Computation Method for Quasi-separatrix Layers. 2022, The Astrophysical Journal, 937, 26

@ARTICLE{2022ApJ...937...26Z,
       author = {{Zhang}, PeiJin and {Chen}, Jun and {Liu}, Rui and {Wang}, ChuanBing},
        title = "{FastQSL: A Fast Computation Method for Quasi-separatrix Layers}",
      journal = {\apj},
     keywords = {Solar magnetic fields, GPU computing, 1503, 1969},
         year = 2022,
        month = sep,
       volume = {937},
       number = {1},
          eid = {26},
        pages = {26},
          doi = {10.3847/1538-4357/ac8d61},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2022ApJ...937...26Z},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}