• View homepage{:target="_blank"} / View github page{:target="_blank"}
• Python-based Corona Field modeling tool.
• Authors: Chingam Fong, Kenny C. Y. Ng (the Chinese University of Hong Kong)
• Can be used to analytically calculate Current Sheet Source Surface (CSSS) model and Potential Field Source Surface (PFSS) model on a preset grid, or at any arbitrary point.
• Incorporating sunpy, with field line tracing and visualization funcationalities.
• Multi-threading capable. Reasonably fast.

Example usage

• View notebook on GitHub{:target="_blank"}

Required pacakges

• Necessary: numpy, scipy, sunpy, streamtracer (from sunpy), astropy, matplotlib.pyplot
• Optional: pfsspy (for comparison)

Method

• The functions follows the same logic as the IDL code by Prof. Xuepu Zhao, hosted on Stanford solar group website http://sun.stanford.edu/~xuepu/DATA/
• See the original papers for the details in mathmatical formulism:
  • PFSS: Hoeksema, 1984; Wang and Sheeley Jr., 1992
  • CSSS: Zhao and Hoeksema, 1994; Zhao and Hoeksema, 1995
  • Notes on PFSS-like models: Xudong Sun, http://wso.stanford.edu/words/pfss.pdf

Acknowledgement

• We thank Prof. Xudong Sun, Dr. Guanglu Shi for useful discussions, Prof. J. Todd Hoeksema for permission to reproduce the code.

Change logs:

• 2026-03-04 pre-alpha, all functions made public on GitHub, with 1 notebook showing basic usage