The solar spectral irradiance 1200–2550 Å at solar maximum

Abstract

Full‐disk solar spectral irradiances at solar maximum were obtained in the spectral range 1200–2550 Å at a spectral resolution of approximately 1 Å from rocket observations above White Sands, New Mexico, on June 5, 1979. Comparison with measurements made near solar minimum indicates approximately a factor of 2.5 increase in the irradiance at 1200 Å, a 20% increase near 1800 Å, and no increase within our measurement errors (±15%) above 2100 Å. Irradiances in the range 1800–2100 Å are in excellent agreement with previous measurements, but those in the 2100‐ to 2550‐Å range are significantly lower. The intensities of strong emission lines at wavelengths below 1850 Å are also reported.