SunCET instrument parameters needed to calculate SNR.
|Wavelength||170–200 Å||Broadband response defined by mirror coating|
|Aperture size||44.9 cm2||9.6 cm diameter truncated on two sides to a height of 7.62 cm and a 4.8 cm diameter secondary mirror obscuring its center|
|Weighted factor for broadband||6.88||7 emissions in the bandpass weighted by their quiet-Sun intensity to the 195 Å emission line (see Table 1)|
|Pixel size||7 μm × 7 μm||e2v CIS115 datasheet and confirmed in house|
|Pixel array||1500 × 1500||Full array is 1504 × 2000; ∼5 rows dedicated to dark|
|FOV||4 R⊙||Design FOV (requirement is 3.5 R⊙)|
|Plate scale||4.811/pixel||From pixel size, number of pixels, and FOV; Note that 2×2 binning will be applied, resulting in 9.611/resolution-element|
|Optics throughput||0.06||2 mirrors with B4C/Mo/Al coatings (0.35 each), entrance Al/C filter (0.6) with 5 lpi filter mesh (0.98), Al secondary/pinhole filter (0.85)|
|Quantum yield||18.3 e−/ph||Average over 170–200 Å bandpass|
|Dark noise||<0.08 e−/pixel/sec||At −10 °C, from LASP lab tests|
|Readout noise||5 e−/pixel||From LASP lab tests|
|Fano noise||1.3 e−/pixel||Fano factor of 0.1 for Si|
|Max read rate||0.1 sec (full frame) 0.025 (up to 500 rows)||In SunCET, 500 rows corresponds to 0–1.33 R⊙|
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