High-resolution spectroscopic imaging of the Sun with a universal birefringent filter and a Fabry-Perot Interferometer |
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Authors: | F Cavallini G Ceppatelli A Righini F Berrilli B Caccin S Cantarano A Egidi P Francia and E Pietropaolo |
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Institution: | (1) Osservatorio Astrofisico di Arcetri, Firenze, Italia;(2) Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Italia;(3) Dipartimento di Fisica, II Università di Roma, Tor Vergata, Italia;(4) Dipartimento di Fisica, Università dell'Aquila, Italia |
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Abstract: | Summary We describe an optical device consisting of a Universal Birefringent Filter and a Fabry-Perot interferometer used in tandem
to obtain monochromatic images of the Sun in the visible spectrum (between 4200 and 7000 ?). The spectral resolving power
is about 300000 and the wavelength stability might reach 0.02 m? at 5000 ? (≈1.2 m/s) with an integration time of 1 s. The
image is recorded by a CCD camera based on a Thomson THX31159 device with 512×512 square pixels 19 μm in size. A prototype
of this instrument was tested at the G. B. Donati Solar Tower of the Arcetri Astrophysical Observatory by obtaining, at fixed
time intervals, several series of full disk monochromatic images of the Sun at different wavelengths inside the Fe I 5905.7
? photospheric line. In this paper we describe the instrument and its characteristics and we give an cccount of the preliminary
results obtained by measuring the global velocity field on the solar photosphere. These results show that the instrument is
well suited for global oscillation measurements.
Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990. |
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Keywords: | Solar physics |
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