The earth's far ultraviolet dayglow (1080-1515 ¿) was observed at ~3.5 ¿ resolution during a period of high solar activity near solar maximum on June 27, 1980. The observations were made at local noon by rocket-borne spectrometers viewing toward the earth's northern limb at 90¿ zenith angle (ZA) at altitudes between 100 and 245 km, and at 98¿ ZA between 245 and 260 km. The solar zenith angle was 8.9¿. These spectra are compared with earlier lower-resolution dayglow data obtained during a period of lower solar activity and with auroral spectra. The brightness ratio of O i &lgr;1356 to the N2 Lyman-Birge-Hopfield (LBH) system, an indicator of the O to N2 density ratio, is lower than that previously measured at mid-latitudes and closer to the value found in aurorae. In the LBH system a depletion of the bands originating on the v'=3 vibrational level of the excited state is found. Some weak N2 Birge-Hopfield bands and N i lines only marginally detected previously in the dayglow are confirmed.