Date & Time of Solution 2 May 2007 17:30 UT
Author Yingna Su
GOES Flare C8.5
Axial Flux (10 20 MX) 7 ± 2
Poloidal Flux (1010 MX cm-1) 1
Potential Energy (1032 ergs) 9.6
Free Energy (1031 ergs) 8.7 ± 2.5
Relative Helicity (1042 Mx2) 4.38 ± 1.25
The background images in the top and middle panels show the XRT observations
at the early phase of the C8.5 flare. The white and grey contours overlaid
on the middle panels refer to 3--6 and 6--12 keV RHESSI observations, respectively.
The X-ray contours (XRT) overlaid on the corresponding TRACE EUV images are
shown in the bottom panels.
Magnetic map of AR 10953 on 2007 May 2 at 17:30 UT derived from Hinode/SOT/SP
(high-resolution part) and SOHO/MDI data. The vectors show the horizontal components
of the observed magnetic field. The white line ended with two circles refers to the selected
filament path along which he flux rope is inserted.

NLFFF models with different axial flux for AR 10953 versus the observed non-potential
X-ray loops on 2007 May 2. The top panels show the four X-ray loops observed at different
times prior to the C8.5 flare. The same loops (red line) overlaid with the best-fit model
field lines (blue, light blue) are shown in the bottom panels.

Comparison of observed (blue, SOT/SP) and modeled (black) vector magnetograms.

Results for one of the best-fit NLFFF model (Pol=1e10 Mx/cm, Axi=9e20 Mx) for AR 10953
at 17:30 UT on 2007 May 2. (a) XRT image at the flare onset overlaid with red and green contours
representing positive and negative polarities. (b) is a side view of (a). (c) Distribution of radial
component of current density. (d) Hollow core distribution of electric currents in a vertical
cross-section of the flux rope. The location of the vertical plane is shown by the yellow line in (c).
The white region refers to the current layer, and a possible reconnection site (RS) at the flare onset
is marked by a red star. The white circles represent the crossing point of the model field lines
and the yellow line in (c). The color lines in (a) and (b) and the white lines in (c) and (d) refer to
the selected model field lines. The field line marked by black arrows refer to one of the best-fit
model field lines for a nearly potential flare loop which appears at the flare onset.
Movies Movie 1: TRACE, Hinode/XRT and MLSO observations of the flare
Point of Contact Yingna Su -

Last modified: Monday Apr 9 10:26 EDT 2012