SunCET spectrograph instrument parameters needed to calculate SNR.
|Wavelength||170–340 Å||Contains various strong emission lines, including some that show coronal dimming. Defined by grating equation.|
|Aperture size||0.0098 cm2||3.0 mm tall × 28 μm wide|
|Number of Pixels per emission line||2000||500 pixels tall × 4 pixels wide (defined by slit)|
|Pixel size||7 μm × 7 μm||Teledyne e2v CIS115 datasheet and confirmed in house|
|Pixel allocation||500 × 1500||Full array is 1504 × 2000; ∼5 rows dedicated to dark|
|FOV||Full Sun||Solar Irradiance, image the slit|
|Plate scale||0.011 nm||From pixel size, number of pixels, wavelength range; Note: oversampling spectral resolution of 0.1 nm|
|Optics throughput||0.0122||Grating Efficiency (0.06), Pt Grating Coating (0.4),Al/C entrance filter (0.6), 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|
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