1. Flare: motion of H-alpha kernels and coronal sources
Haisheng Ji
Purple Mountain Observatory
Nanjing, China

2. Method to determine the positions of
H-alpha kernel (centroid):
But, we need to subtract the background, in order to get the real
motion !

3. T1 T2
Region 1
Region 2

4. T1 T2
Region 1
Region 2

5. The M-class flare of Sept 9, 2002

6. Background-subtracted H-alpha images

8. Height of the coronal source

9. The November 1, 2004 M-class event taken at Purple
Mountain Observatory with 1s cadence

11. The M-class flare of August 17, 2002. BBSO full disk
images with 1 minute cadence

12. Rhessi HXR source
at different times

13. 12-25 keV
‘Height’ of the
HXR sources
Centroid distance of the two
conjugate Ha kernels

14. The M-1 class flare of July 26, 2002

16. Further work needed:
Classify H-alpha kernel motions
Get fine structure of H-alpha kernel motions
HXR source motions
To infer reconnection behavior
Thanks!