Name:
flow_field_bvec.pro
Purpose:
Calculates properties of flows near magnetic polarity inversion lines (MPILs) in active regions
Calling sequence:
output_flow_field=flow_field(br_t0, bt_t0, bp_t0, idx_t0, br_t1, bt_t1, bp_t1, idx_t1, binxy_flow_field=binxy_flow_field, binxy_mpil=binxy_mpil, $
fwhm_gaussian=fwhm_gaussian, fwhm_align=fwhm_align, fwhm_dave4vm=fwhm_dave4vm, mpil_info=mpil_info, mpil_xy=mpil_xy)
Input parameters:
br_t0 - hmi_sharp_cea_720s Br image at t0 (note that t1 > t0)
bt_t0 - hmi_sharp_cea_720s Bt image at t0
bp_t0 - hmi_sharp_cea_720s Bp image at t0
idx_t0 -hmi_sharp_cea_720s meta data at t0
br_t1 - hmi_sharp_cea_720s Br image at t1
bt_t1 - hmi_sharp_cea_720s Bt image at t1
bp_t1 - hmi_sharp_cea_720s Bp image at t1
idx_t1 -hmi_sharp_cea_720s meta data at t1
Input Keywords:
binxy_flow_field - number for xy spatial binning of the sharp magnetic field input data related to flow field calculation [in pixels] ; default=1 (i.e., no binning)
binxy_mpil - number for xy spatial binning of sharp magnetic field input data related to magnetic polarity inversion line detection [pixels] ; default=1
fwhm_gaussian - full width at half maximum of a gaussian filter for each of MPIL pixels [Mm] ; default=4
fwhm_align - full width at half maximum for sharp image alignment [arcsecs] ; default=10
fwhm_dave4vm - full width at half maximum for flow field calculation [arcsecs] ; default=4
mpil_info - information on types of MPILs
mpil_xy - x and y coordinates of MPILs [pixels]
Output:
output_flow_field - a structure having 22 tags related to flow field properties
v_mean: mean horizontal speed [km/s]
v_median: median horizontal speed [km/s]
vz_mean: mean vertical speed [km/s]
vz_max: max vertical speed [km/s]
diver: diverging flow parameter [km/s Mm]
conver: converging flow parameter [km/s Mm]
shear: shear flow parameter [km/s Mm]
diver_mean: mean diverging flow speed [km/s]
conver_mean: mean converging flow speed [km/s]
shear_mean: mean shear flow speed [km/s]
diver_max: max diverging flow speed [km/s]
conver_max: max converging flow speed [km/s]
shear_max: max shear flow speed [km/s]
w_diver: flux-weighted diverging flow parameter [km/s Mm]
w_conver: flux-weighted converging flow parameter [km/s Mm]
w_shear: flux-weighted shear flow parameter [km/s Mm]
w_diver_mean: flux-weighted mean diverging flow speed [km/s]
w_conver_mean: flux-weighted mean converging flow speed [km/s]
w_shear_mean: flux-weighted mean shear flow speed [km/s]
w_diver_max: flux-weighted max diverging flow speed [km/s]
w_conver_max: flux-weighted max converging flow speed [km/s]
w_shear_max: flux-weighted max shear flow speed [km/s]
Property name in DB:
flow_field_bvec.v_mean, flow_field_bvec.v_median, flow_field_bvec.vz_mean, flow_field_bvec.vz_max, flow_field_bvec.diver, flow_field_bvec.conver, flow_field_bvec.shear, flow_field_bvec.diver_mean, flow_field_bvec.conver_mean, flow_field_bvec.shear_mean, flow_field_bvec.diver_max, flow_field_bvec.conver_max, flow_field_bvec.shear_max, flow_field_bvec.w_diver, flow_field_bvec.w_conver, flow_field_bvec.w_shear, flow_field_bvec.w_diver_mean, flow_field_bvec.w_conver_mean, flow_field_bvec.w_shear_mean, flow_field_bvec.w_diver_max, flow_field_bvec.w_conver_max, flow_field_bvec.w_shear_max
Repository
https://dev.flarecast.eu/stash/projects/FE/repos/flow_field_bvec-idl/browse