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IBIS Description
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IBIS Instrumental Characteristics
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For further details see: Cavallini, F., 2006, Solar Physics, 236, 415. Reardon, K.P. and Cavallini, F., 2008, Astron. and Astrophys., 481, 897. |
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| Usable Wavelength Range | 5800 Å - 8600 Å |
| Available Spectral Channels |
5896 Å - Na D1 6173 Å - Fe I 6302 Å - Fe I 6563 Å - H I 6768 Å - Ni I 7090 Å - Fe I 7224 Å - Fe II 8542 Å - Ca II |
| Channel Width | 4.0 Å (5800 Å - 7500 Å) 6.0 Å (7500 Å - 8600 Å) |
| Field of View | 80" diameter circle |
| Image Scale | 0.083" pixel-1
for full-resolution pixels 0.165" pixel-1 for 2 x 2 binned pixels |
| Exposure Times | 20 - 100 msec |
| Acquisition rate | 2.5 frames/second @ 1024 x 1024(full-resolution) 4 frames/second @ 512 x 512 (2 x 2 binning) 4 frames/second @ 1024 x 512 (full-resolution) |
| Spectral Resolving Power | 212,000 - 274,000 |
| Maximum Radial Wavelength Shift | 60 mÅ - 90 mÅ |
| Wavelength Drift of Transmission Profile | ≤ 10 ms-1 over 10 hours |
| Peak Instrumental Transparency | 15% - 20% |
| Wavelength Tuning Time | ~ 50 ms |
IBIS Fabry-Perot Characteristics
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Fabry-Perot #1 | Fabry-Perot #2 | |
| Plate Spacing | Nominal | 2.30 mm | 0.66 mm |
| Measured | 2.299 mm | |
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| Flatness | Nominal | λ/150 | λ/150 |
| Measured | -40, +140 Å | -40, +110 Å | |
| Reflectivity | Nominal | 0.934 | 0.934 |
| Measured | 0.925 | 0.921 | |
| FWHM | Nominal | 22.6 mÅ | 78.4 mÅ |
| Measured | 22.1 mÅ | 85.2 mÅ | |
| Absorbtion | Nominal | 0.002 | 0.002 |
| Measured | 0.002 | 0.002 | |
Last Updated: 04 May, 2004