Further measurements of the submillimeter background at balloon altitude

Measurements of the far-infrared background radiation were made with a balloon-borne radiometer at an altitude of 44 km. Equivalent blackbody temperatures of ${2.55}_{-0.45}^{+0.25}$, ${2.45}_{-1.05}^{+0.45}$, and ${2.75}_{-2.75}^{+0.8}$ °K were obtained for the background radiation in bandwidths extending from 1 to 11.5, 13.5, and 18.5 cm⁻¹. The total measured flux in the largest bandwidth is dominated by the atmospheric emission by ozone and water. The radiation of these atmospheric components was determined independently in a separate pair of radiometer spectral responses.