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

13. Result (2)

14. Result (1)

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

17. THANKS!