dswrf = Downward Solar Radiation Flux
http://dl.tpac.org.au/thredds/ncss/ncep1/other_gauss/dswrf.ntat.gauss/dswrf.ntat.gauss.1967.nc?latitude=&longitude=&time_start=1967-01-01T00%3A00%3A00Z&time_end=1967-12-31T18%3A00%3A00Z&accept=xml