ARCETRI SOLAR PHYSICS GROUP

IBIS Description
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IBIS Instrumental Characteristics


For further details see:
Cavallini, F., 2006, Solar Physics, 236, 415.
Reardon, K.P. and Cavallini, F., 2008, Astron. and Astrophys., 481, 897.
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

Fabry-Perot #1 Fabry-Perot #2
Plate Spacing Nominal 2.30 mm 0.66 mm
Measured 2.299 mm
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