Flare: motion of H-alpha kernels and coronal sources
Haisheng Ji
Purple Mountain Observatory
Nanjing, China
Method to determine the positions of H-alpha kernel (centroid):
But, we need to subtract the background, in order to get the real motion !
T1
T2
Region 1
Region 2
T1
T2
Region 1
Region 2
The M-class flare of Sept 9, 2002
Background-subtracted H-alpha images
Height of the coronal source
The November 1, 2004 M-class event taken at PurpleMountain Observatory with 1s cadence
The M-class flare of August 17, 2002. BBSO full diskimages with 1 minute cadence
Rhessi HXR sourceat different times
12-25 keV
‘Height’ of theHXR sources
Centroid distance of the twoconjugate Ha kernels
The M-1 class flare of July 26, 2002
Further work needed:
1) Classify H-alpha kernel motions2) Get fine structure of H-alpha kernel motions3) HXR source motions
To infer reconnection behavior
Thanks!