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!