The spectro-interferometer of the Arcetri Solar Tower

Details The spectro-interferometer of the Arcetri Solar Tower The spectro-interferometer of the Arcetri Solar Tower

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184..386c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 386-392. Research supported by the Universitadi Fi

Astronomy and Astrophysics

Astrophysics

11

Astronomical Spectroscopy, Fabry-Perot Interferometers, Solar Instruments, Spectrometers, Absorption Spectra, Block Diagrams, Line Spectra, Towers, Visible Spectrum

Scientific paper

The authors describe the spectro-interferometer installed at the Arcetri Observatory Solar Tower. This instrument basically consists of a Fabry-Perot interferometer mounted in tandem with a medium sized grating spectrograph, acting as order sorter. This mounting allows the measurement of solar absorption lines in the range 5500 - 6500 Å with high wavelength stability (0.08 mÅ rms in 12 h) and high spectral resolution (900,000 at 6328 Å). An image guider allows the pointing of an assigned solar region with an accuracy better than 2arcsec rms. This instrument, suitable for investigating line shifts and asymmetries, has been extensively used for studying such solar problems as meridional mass motions, line asymmetry "5-min" oscillations, and convective effects in solar active regions.

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