Solar Physics

, Volume 236, Issue 2, pp 415–439

IBIS: A New Post-Focus Instrument for Solar Imaging Spectroscopy


DOI: 10.1007/s11207-006-0103-8

Cite this article as:
Cavallini, F. Sol Phys (2006) 236: 415. doi:10.1007/s11207-006-0103-8


A new instrument for solar bi-dimensional spectroscopy, the Interferometric BIdimensional Spectrometer (IBIS), has been successfully installed at the Dunn Solar Telescope of the National Solar Observatory (USA-NM) in June 2003. This instrument is essentially composed of a series of two Fabry-Perot interferometers and a set of narrow-band interference filters, used in a classic mount and in axial-mode. It has been designed to take monochromatic images of the solar surface with high spectral (R ≥ 200 000), spatial ≃ 0.2″), and temporal resolution (several frames s−1). IBIS has a circular field of view, 80″ in diameter and, with suitable interference filters, it can be used in the wavelength range 580 – 860 nm. The wavelength stability of the instrumental profile is very high, the maximum drift in 10 hours amounting to ≃10 m s−1. In this paper the criteria used in the design and the expected instrumental characteristics are described.

Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  1. 1.INAF: Osservatorio Astrofisico di ArcetriFirenzeItaly

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