Table 5

SunCET spectrograph instrument parameters needed to calculate SNR.

Instrument parameter Value Description
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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