Hi,
I would like to ask your help to explain our result derived from METEOSAT MFG and NOAA global surface incoming short wave radiation data.
We have used the SIS from METEOSAT/MFG monthly mean and SIS from polar orbit monthly mean data between 2001 and 2005 for Hungary.
We derived the difference of these two kind global radiation maps for that period. At first we made the difference between two set of SIS data (MFG minus NOAA), after it mean was calculated for the whole country.
As you can see in the enclosed image the difference between the SIS data derived from MFG and NOAA seems to be an increasing trend during the 5 year period. We have compared these values with observed surface measurements to check and investigate this result. A very good correspondence be seen between the Meteosat and the ground measurement, but if we compare it with NOAA data we can see increasing difference (like a trend) during the examined period.
We have thought it might be caused by the NOAA path delay. But we checked it in our dataset, and we did not see remarkable delay in the pathes.
Thanks a lot!
Regards, Ildikó