A&A Supplement series, Vol. 128, March II 1998, 589-598
Received June 17; accepted July 29, 1997
F. Cavallini
Send offprint request: F. Cavallini
e-mail: fabio@utorre.arcetri.astro.it
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5,
I-50125 Firenze, Italy
A new instrument for solar
bidimensional spectroscopy,
the Italian Panoramic Monochromator (IPM), has been recently
installed on the Télescope Heliographique pour l'Étude du
Magnétisme et des Instabilités de l'atmosphère Solaire
(THEMIS), the French-Italian solar telescope built
in Tenerife (Canary Islands).
On a square field 
, this instrument allows one
to obtain monochromatic images of the solar surface
with high spectral resolution (
256000 at 5500 Å),
preserving all the spatial resolution delivered by the
telescope (
).
The wavelength stability of the instrumental profile is very
high, the maximum drift in 10 hours amounting to about 10 ms-1.
keywords: instrumentation: interferometers -- instrumentation: spectrographs -- Sun: photosphere -- Sun: chromosphere