uswrf = Upward Solar Radiation Flux
http://portal.sf.utas.edu.au/thredds/ncss/ncep1/other_gauss/uswrf.ntat.gauss/uswrf.ntat.gauss.1969.nc?latitude=&longitude=&time_start=1969-01-01T00%3A00%3A00Z&time_end=1969-12-31T18%3A00%3A00Z&accept=xml