The solar EUV irradiance from 30 to 100 nm was obtained from a sounding rocket experiment launched from the White Sands Missile Range, New Mexico, on November 10, 1988. This measurement will be used to cross calibrate the Airglow-Solar Spectrometer Instrument on the San Marco D/L satellite. The solar EUV spectrograph had pre- and post-flight photometric calibrations with an average uncertainty of 6% at the Synchrotron Ultraviolet Radiation Facility (SURF) at the National Institute of Standards and Technology. The observed solar EUV irradiance is about 20% less than the solar EUV flux from a proxy model based on the daily 10.7-cm solar flux (F10.7) and its 81-day mean (〈F10.7〉) and the AE-E solar EUV data taken in the 1970's. This measurement was obtained during the ascending phase of the solar cycle 22, while the AE-E data were obtained during the ascending phase of solar cycle 21. Measurements of the solar Lyman &agr; irradiance at 121.6 nm were also obtained with an nitric oxide ionization cell. The derived Lyman &agr; flux is 3.30¿0.5 (¿1011 photons s-1 cm-2) as compared to 3.35¿0.3 derived from the Solar Mesospheric Explorer solar data on November 10, 1988. ¿ Copyright 1990 by the American Geophysical Union |