The National Climatic Data Center (NCDC) home page is
The Special Sensor Microwave/Imager (SSM/I) Dataset home page on the
WWW is "http://www.ncdc.noaa.gov/ol/satellite/ssmi/ssmiproducts.html". ...
The NSRDB is a serially complete collection of hourly values of the
three most common measurements of solar radiation (global horizontal,
direct normal, and diffuse horizontal) over a period of time ...