Correlation time (or relaxation parameter) for the ionospheric data assimilation. each .nc file in this folder corresponds to a particular bin. Binning in season: 0=month 1,2,11,12 1=month 5,6,7,8 2=month 3,4,9,10 Binning in F10.7 solar flux: 0=0-100 s.f.u 1=100-200 s.f.u. 2=200-350 s.f.u. Example: The name of the .nc file: Corr_Time_season_02_sf_01.nc would correspond to season with bin 2, solar flux with bin 1. Inside of the .nc files: Mlons=array of geomagnetic longitudes (degrees) Mlats=array of geomagnetic latitudes (degrees) corr_time=array of size (nlon, nlat), is a map of correlation times (hours)