README
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- Analysis performed on NOAA AR 10134.
- The ambiguity-free vector magnetogram of the AR is given for 7 vector 
  magnetograms in files vec_mag_[UT time].gif
- The horizontal cross-field velocity as inferred by solving the ideal 
  induction equation for the 6 pairs of vector magnetograms of the AR 
  is given in files vec_vel_[UT time].gif
- Each vector magnetogram corresponds approx. to a 20-min average of the 
  BBSO/VMG Stokes profiles
- The magnetic field components shown are the heliographic components 
  on the image (observer's) plane
- Observation date is 09/28/02
- Observation instrument is BBSO/VMG


- The file energy_helicity.pdf corresponds to the evaluation of the energy  
  helicity formula in the linear force-free approximation for the 7 vector 
  magnetograms of the AR. The calculation has been performed on the 
  heliographic plane.

- The file flux_imbalance.gif shows the imbalance between the positive and 
  the negative flux vs. time in the AR. There is significant flux imbalance 
  in favor of positive fluxes, which gives rise to the large errors obtained 
  in the various linear force-free calculations.  

- The file helicity_rates.gif corresponds to the helicity variation rate in 
  the AR for the 6 magnetogram pairs for which the cross-field flows could 
  be calculated. Notice that *only* the helicity rate for the cross-field 
  flows is shown; this is because we have no Doppler velocity information 
  for the AR so the field-aligned flows cannot be calculated.