Absolute, Extreme-Ultraviolet Solar Spectral Irradiance Monitor (AESSIM)
Final technical rept. 15 Nov 1989-14 Nov 1993
HARVARD COLL OBSERVATORY CAMBRIDGE MA
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The goal of this research program was development of a method for obtaining daily radiometrically accurately, solar spectral irradiance data at EUV wavelengths. In orbit radiometric instrumentation recalibration is a fundamental requirement for accurate spectral flux measurements. We have studied a low-pressure version of the EUV radiance standard and concluded that a substantial redesign of it would be required if a suitable one is to be developed for in orbit calibration of a solar spectral irradiance monitor. We have reviewed the use, suitability, and the availability of thin film filters for in orbit EUV calibration. In our opinion, the availability of space qualified filters has not been verified. We have evaluated and chosen a design of a 4-spectrograph, flat-field package that provides 0.1 to 0.2 nm resolution in the range 5-175 nm with a total weight including detectors of 1.6 Kg. Several mission concepts, which involve rocket-borne, calibrated spectrometer underflights to recalibrate the Voyager spacecraft have been considered. Solar, Extreme-ultraviolet, Radiometric calibration.
- Ultraviolet Detection and Detectors