15 October 1997 HiRES: the High-Resolution EUV Spectroheliometer
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Abstract
The high-resolution EUV spectroheliometer (HiRES) is our first step towards the 0.1 arc sec angular resolution goal at EUV wavelengths. The HiRES instrument consists of a Gregory telescope with a 45-cm-diameter primary mirror, and an imaging EUV spectrometer, employing a single-reflection toric diffraction grating in a Rowland circle mounting and an imaging pulse-counting multi-anode microchannel array (MAMA) detector system. The MAMA detector covers the spectral range from 560 to 631 angstrom with a spectral resolution of 70 mAngstrom. A Pt/Ne lamp impresses a wavelength calibration spectrum on the upper part of the detector while the solar spectrum is recorded simultaneously on the lower part. The times-of-arrival and addresses of the detected photons are transmitted directly to the ground to allow correction of the SPARCS pointing jitter. The HiRES spectrometer slit is pointed to a specific location using real-time control of the SPARCS, and SPARCS can be commanded to execute a linear (push broom) scan across the sun. Two EUV photodiodes are used to measure the absolute sola irradiances and the atmospheric extinction profiles in wavelength bands centered at 304 angstrom and 584 angstrom respectively.
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J. Gethyn Timothy, J. Gethyn Timothy, Paolo Bergamini, Paolo Bergamini, Jagadish C. Bhattacharyya, Jagadish C. Bhattacharyya, Martin H.C. Huber, Martin H.C. Huber, Surendra K. Jain, Surendra K. Jain, Giampiero Naletto, Giampiero Naletto, Ralph W. Nicholls, Ralph W. Nicholls, Piergiorgio Nicolosi, Piergiorgio Nicolosi, Ajay Kumar Saxena, Ajay Kumar Saxena, Giuseppe Tondello, Giuseppe Tondello, Arthur B. C. Walker, Arthur B. C. Walker, } "HiRES: the High-Resolution EUV Spectroheliometer", Proc. SPIE 3114, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VIII, (15 October 1997); doi: 10.1117/12.290135; https://doi.org/10.1117/12.290135
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