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Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang

Magnetic Reconnection Rate and RHESSI Hard X-Ray Imaging Spectroscopy of Well Resolved X-class Flares. Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang. 2003 Oct. 29 X10. Red: NIR flare ribbons Blue: RHESSI HXR contours correspond to the 50 – 100 keV. Ding et al. 2003.

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Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang

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  1. Magnetic Reconnection Rate and RHESSI Hard X-Ray Imaging Spectroscopy of Well Resolved X-class Flares Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang

  2. 2003 Oct. 29 X10 Red: NIR flare ribbons Blue: RHESSI HXR contours correspond to the 50 – 100 keV

  3. Ding et al. 2003

  4. According to Brown et al. 2002 Therefore, electrons with energy greater than 200 could reach 1022 cm-2 Loop length ~ 109 cm, number density in corona ~ 1011 cm-3 ==> Ncorona~ 1020cm-2

  5. More complicate treatment: N ~ , b… Brown et al. 2002

  6. We need more events…

  7. G-band Observations

  8. Footpoint Asymmetric e e α

  9. Footpoint Asymmetric e e α α  ? RHESSI Visibility + Forward-fit

  10. Footpoint Asymmetric B   ?

  11. Magnetic/Mirror Effect?  = -2.80  = -2.53  = -2.72

  12. Magnetic/Mirror Effect?  = -2.74  = -2.50  = -2.60

  13. Magnetic/Mirror Effect?

  14. Magnetic/Mirror Effect? Power Index B (Gauss)

  15. Shear Angle 20:40:54 20:41:32 20:41:46 20:41:52 20:41:58 20:42:02 20:42:08 20:42:18

  16. Shear Angle 20:40:54 20:41:32 20:41:46 20:41:52 20:41:58 20:42:02 20:42:08 20:42:18

  17. Shear Angle 20:41:32 20:42:02

  18. Shear Angle 20:41:32 20:42:02 Change Rate vs. ???

  19. G-band ~ E field ~ Power-index

  20. G-band ~ E field ~ Power-index Contrast Electric Field (V/cm)

  21. G-band ~ E field ~ Power-index Contrast Electric Field (V/cm)

  22. Electron Acceleration Rate RHESSI Observations: Total Number of particles inside the acceleration region Rate of acceleration of electrons (from spatially-integrated HXR intensity) Specific Acceleration Rate

  23. Super-Dreicer Electric Field Acceleration E (Somov 1991) RHESSI observations ~ Vector Magnetograms B// B^ B//

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