Ionospheric Horizontal Correlation Length Derived From IRI-2016 Model Errors

Ionospheric horizontal correlation length based on IRI-2016 model and JPL Global Ionospheric Maps. This metadata can be used for the construction of the covariance matrix for ionospheric data assimilation.

each .nc file corresponds to one bin. 

Binning in season (winter, summer, equinox):

00=month 1,2,11,12
01=month 5,6,7,8
02=month 3,4,9,10
                   
Binning in F10.7 solar flux (low, moderate, high):

00=0-100 s.f.u
01=100-150 s.f.u.
02=150-350 s.f.u.                   
                             
Binning in UT: 2-h frames. 

Example: 
The name of the .nc file:       
Corr_Length_IRI_seazon_01_sf_00_UT_18.nc   
would correspond to summer season, low solar flux, 18-20 UT. 

Inside of the .nc files:

longitudes=array of geomagnetic longitudes (degrees)
latitudes=array of geomagnetic latitudes (degrees)
zonal_corr_length=array of size (nlon, nlat), is a map of zonal correlation lengths
merid_corr_length=array of size (nlon, nlat), is a map of meridional correlation lengths
L_4d=array of size (nlon, nlat, 4), is a map of correlation lengths in 4 perpendicular azimuthal directions; 0=0 deg, 1=90 deg, 2=180 deg, 3=-90 deg
L_az=array of size (nlon, nlat, 36), is a map of correlation lengths in 36 azimuthal directions (0,10,20,30,...,350 deg)