dswrf = Downward Solar Radiation Flux
http://portal.sf.utas.edu.au/thredds/ncss/ncep1/other_gauss/dswrf.ntat.gauss/dswrf.ntat.gauss.1980.nc?latitude=&longitude=&time_start=1980-01-01T00%3A00%3A00Z&time_end=1980-12-31T18%3A00%3A00Z&accept=xml