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Characterization of Hα Filbril Structure: Accuracy of NLFF Extrapolation Methods

This study presents a comprehensive methodology for characterizing Hα filbril structures using image gradient information. By comparing the chromospheric magnetic fields derived from Nonlinear Force-Free Field (NLFF) extrapolation with Hα observations, we evaluate the accuracy of the NLFF extrapolation method. The findings indicate that the orientation identified at the boundaries of the filbril structure provides superior accuracy compared to other regions. This work contributes valuable insights into the chromospheric dynamics and magnetic field structures.

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Characterization of Hα Filbril Structure: Accuracy of NLFF Extrapolation Methods

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  1. Characterization of Hα Filbril Structure YUAN YUAN Space Weather Research Lab Oct. 26th, 2010

  2. Abstract • Introduction • Method • Results • Conclusion

  3. Introduction (1) • Motivation • Compare the chromospheric magnetic fields (found out using NLFF extrapolation) with Hα Filbril Structure to measure the accuracy of NLFF extrapolation method

  4. Introduction (2) The filament structure seen in the extrapolated chromoshpere (a) and in Hα observation (b). Courtesy of Ju Jing et al., (2010).

  5. Method (1) Modeling of Hα Filbril Structure

  6. Method (2) Modeling of Hα Filbril Structure

  7. Method (3)

  8. Method (4)

  9. Method (5)

  10. Result (1)

  11. Result (2)

  12. Result (1)

  13. Conclusion • An Hα FilbrilStructure characterization method is put forward using image gradient information. • The orientation identified on the boundary of filbril structure is more accurate than other region.

  14. Thanks!

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