Name:
null_point.pro
Purpose:
Finds magnetic null points from 3D potential magnetic field data.
Calling sequence:
output_null_point=null_point(c_img, binxy_null_point=binxy_null_point, binxy_mpil=binxy_mpil, extend=extend, mpil_info=mpil_info, mpil_xy=mpil_xy)
Input parameters:
c_img - Br or Blos HARP cutout magnetogram, corrected for limb presence. Blos cutout should be deprojected
Input Keywords:
binxy_null_point - number for xy spatial binning of the sharp magnetic field input data [in pixels] ; default=2
binxy_mpil - number for xy spatial binning of sharp magnetic field input data related to MPIL detection [pixels] ; default=2
extend - length of a square box surrounding each of MPIL pixels [Mm]. The box region will be considered for calculating properties of null points therein; default=5
Output Keywords:
mpil_info - information on types of MPILs
mpil_xy - x and y coordinates of MPILs [pixels]
Output:
output_null_point - a structure having 3 tags related to the properties of null points
n_np: total number of null points in the height range of 2 to 100 Mm
n_np_2_10: total number of null points in the height range of 2 to 10 Mm
n_np_10_100: total number of null points in the height range of 10 to 100 Mm
Property name in DB:
null_point.n_np, null_point.n_np_2_10, null_point.n_np_10_100
Repository
https://dev.flarecast.eu/stash/projects/FE/repos/null_point-idl/browse