| Procedure 
 
 
                    From the loops very little can
be known about the actual magnetic field lines.
 
 
 
                    The idea is to
manually draw
the loops on a computer screen and comparing these curves with
 the shape of field lines with a range of different
 alphas.
 
 
 
                    The best fitting
field line, for a given loop, would give the best estimate of α for that
particular loop.
 
 
 
 |  fig.2.
Coronal loops in EUV as observed by spacecrafts
 
 |