Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..272b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 272-278. Research supported by the Association of U
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, Fabry-Perot Interferometers, Filtergrams, Solar Instruments, Solar Spectra, Calibrating, High Resolution, Line Spectra, Spectrophotometry, Solar Instruments, Spectrophotometry, Monochromatic Imaging, Solar Line Profiles
Scientific paper
We report the details of the spectral calibration, together with bench and field tests, of a 20 mÅ bandwidth tunable filter system to be used in imaging spectroscopy of the solar atmosphere. The design of the filter has been described in a previous paper. The completed instrument has been fully tested in 1988 at the Vacuum Tower Telescope of Sacramento Peak, and is the first of this high spectral resolution.
Bench tests on the Fabry-Perot show a spectral stability and repeatability of 0.55 mÅ and 0.18 mÅ respectively. The spectral calibration of the Fabry-Perot has been done using the tunable birefringent filter passband and a continuum source as a reference. We have determined the interference order and then refined the tune solutions with high order polynomials fitted on the minima of quiet-Sun absorption lines, reaching a maximum tuning error ≤ 1 mÅ over all the visible spectrum. The solar spectrum has then been sampled to field-test the spectral behaviour of the system, which confirms the expected bandwidth and tuning precision. Finally, we report the first 20 mÅ filtergrams, obtained at Sacramento Peak with an RCA 504 CCD, tuning the filter system and sampling the Ca 1 6162.18 Å absorption line. The filtergrams show different layers of the solar photo sphere, approximately from 150 km above τ5000 = 1 to the temperature minimum, at 500 km. The obtained 3D cut of the photosphere is rather effective thanks to the spectral resolution of the filter.
Bonaccini Domenico
Stauffer Franck
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