Absolute, Extreme-ultraviolet Solar Spectral Irradiance Monitor (AESSIM)

Details Absolute, Extreme-ultraviolet Solar Spectral Irradiance Monitor (AESSIM) Absolute, Extreme-ultraviolet Solar Spectral Irradiance Monitor (AESSIM)

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hco..reptq....p&link_type=abstract

Final Technical Report, 15 Nov. 1989 - 14 Nov. 1993 Harvard Coll. Observatory, Cambridge, MA.

Physics

Calibrating, Extreme Ultraviolet Radiation, Solar Radiation, Solar Spectra, Ultraviolet Spectrometers, Radiometric Resolution, Spectrum Analysis, Ultraviolet Filters

Scientific paper

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.

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