dswrf = Downward Solar Radiation Flux
http://dl.tpac.org.au/thredds/ncss/ncep1/other_gauss/dswrf.ntat.gauss/dswrf.ntat.gauss.2001.nc?latitude=&longitude=&time_start=2001-01-01T00%3A00%3A00Z&time_end=2001-12-31T18%3A00%3A00Z&accept=xml