The Spectral Irradiance Monitor: Scientific Requirements, Instrument Design, and Operation Modes

Details The Spectral Irradiance Monitor: Scientific Requirements, Instrument Design, and Operation Modes The Spectral Irradiance Monitor: Scientific Requirements, Instrument Design, and Operation Modes

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005soph..230..141h&link_type=abstract

Solar Physics, Volume 230, Issue 1-2, pp. 141-167

Physics

22

Scientific paper

The Spectral Irradiance Monitor (SIM) is a dual Fèry prism spectrometer that employs 5 detectors per spectrometer channel to cover the wavelength range from 200 to 2700 nm. This instrument is used to monitor solar spectral variability throughout this wavelength region. Two identical, mirror-image, channels are used for redundancy and in-flight measurement of prism degradation. The primary detector for this instrument is an electrical substitution radiometer (ESR) designed to measure power levels ˜1000 times smaller than other radiometers used to measure TSI. The four complementary focal plane photodiodes are used in a fast-scan mode to acquire the solar spectrum, and the ESR calibrates their radiant sensitivity. Wavelength control is achieved by using a closed loop servo system that employs a linear charge coupled device (CCD) in the focal plane. This achieves 0.67 arcsec control of the prism rotation angle; this is equivalent to a wavelength positioning error of δλ/λ = 150 parts per million (ppm). This paper will describe the scientific measurement requirements used for instrument design and implementation, instrument performance, and the in-flight instrument operation modes.

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