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Table 2.
Optical system parameters of the SPICE instrument.
| Parameter | Value |
|---|---|
| Telescope | |
| Entrance aperture size | 43.5 mm × 43.5 mm |
| Distance entrance aperture to mirror | 770.8 mm |
| Focal length of parent paraboloid | 622 mm |
| f-number | 14.30 |
| Plate scale at slit | 3.02 μm/″ |
| Instantaneous FOV | Slit length: 11′, plus ±0.5′ “dumbbell” apertures, oriented solar north-south |
| Width, rastered FOV | 16′ |
| Slits | Widths: 2″, 4″, 6″, and 30″ |
| Spectrometer | |
| Wavelength range, SW | 70.387–79.019 nm (1st order) |
| Wavelength range, LW | 97.254–104.925 nm (1st order) |
| 48–53 nm (2nd order) | |
| Slit to grating distance | 128 mm |
| Grating groove density and ± chirp | 2400 ± 1.7% mm−1 |
| Grating image distance, SW mid-band | 692.43 mm |
| Grating image distance, LW mid-band | 720 mm |
| Spectrometer magnification (image-distance/slit-distance) | ~5.5 |
| Grating ruling period d | 1/2400 mm |
| Grating angle of incidence | −1.7584° |
| Grating angle of diffraction (at SW, LW) | +8.5498° at 74.7 nm +12.2398° at 101.12 nm |
| Dispersion, at image plane | 0.0095 at 74 nm 0.0083 at 101 nm (per pixel spacing) |
| Detector | |
| Pixel spacing | 0.018 mm |
| Angle of incidence on detector (SW, LW) | 27.33° at 74.7 nm, 35.33° at 101.12 nm |
| System focal length (SW) | 3.371 m |
| System spatial plate scale | 1.101″ px−1 at 74 nm, 1.059″ px−1 at 101 nm |
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