Magnetic Reconnection Rate and RHESSI Hard X-Ray Imaging Spectroscopy of Well Resolved X-class Flares Yan Xu, Ju Jing, Wenda Cao, and Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang Haimin Wang
Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang
Dec 31, 2015
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. - PowerPoint PPT Presentation
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Magnetic Reconnection Rate and RHESSI Hard X-Ray
Imaging Spectroscopy of Well Resolved X-class Flares
Yan Xu, Ju Jing, Wenda Cao, and Yan Xu, Ju Jing, Wenda Cao, and Haimin Wang Haimin Wang
2003 Oct. 29 X10
Red: NIR flare ribbonsRed: NIR flare ribbonsBlue: RHESSI HXR contours correspond to the 50 – 100 keVBlue: RHESSI HXR contours correspond to the 50 – 100 keV
NIR/OpticalEmission
From Under Photosphere?
OrUpper Layers?
Photosphere
Direct Heating
Lower Chromosphere
Back-warming?
Enough power?
Low-NMagnetic field? Hard spectrum
Low Contrast
Few %Delay
NIR/OpticalEmission
From Under Photosphere?
OrUpper Layers?
Photosphere
Direct Heating
Lower Chromosphere
Back-warming?
Enough power?
Low-NMagnetic field? Hard spectrum
Low Contrast
Few %Delay
Ding et al. 2003
According to Brown et al. 2002
Therefore, electrons with energy greater than 200 could reach 1022 cm-2
2220 )20
(10)(keV
cmzN
Loop length ~ 109 cm, number density in corona ~ 1011 cm-3 ==> Ncorona~ 1020
cm-2
Brown et al. 2002
More complicate treatment: N ~ , b…
We need more events…
Date Contrast Enhancement (G-band)
Peak HXR Flux
(25 ~ 50 keV)
Peak HXR Flux
(50 ~ 100 keV)
Position (Cosθ)
2003-Oct-29 118% 15260 12800 0.92
2003-Nov-02 230%* 23380 7500 0.49
2006-Dec-06 336% 4460 3200 0.45
2006-Dec-13 104% 3400 1200 0.89
2006-Dec-14 84.5% 2000 540 0.69
G-band Observations
Footpoint Asymmetrice
e
α
Footpoint Asymmetrice
e
α
α ?
RHESSI Visibility + Forward-fit
Footpoint Asymmetric
B0 B0 B1 B2
B ?
Magnetic/Mirror Effect?
= -2.80
= -2.53
= -2.72
Magnetic/Mirror Effect?
= -2.74
= -2.50
= -2.60
Magnetic/Mirror Effect?
Magnetic/Mirror Effect?
B (Gauss)
Po
wer In
dex
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
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
Shear Angle
20:41:32 20:42:02
Shear Angle
20:41:32 20:42:02
Change Rate vs. ???
G-band ~ E field ~ Power-index
G-band ~ E field ~ Power-index
Electric Field (V/cm)
Contras
t
G-band ~ E field ~ Power-index
Electric Field (V/cm)
Contras
t
RHESSI Observations: Total Number of particles inside the acceleration region Rate of acceleration of electrons (from spatially-integrated HXR intensity) Specific Acceleration Rate
Electron Acceleration Rate
LnrLrnnVN 4)2( ) 2( 22
)20(]
21
,2[
)2(1031.9)(
]21
,2[
)2(4 332
keVIB
IB
KRN
BH
N
Nspecific
Super-Dreicer Electric Field Acceleration
/// 13.0~ BBspecific (Somov 1991)
B//
B//
BE
RHESSI observations ~ Vector Magnetograms
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