http://www.themis.iac.es/ 2026-05-05T04:26:11+00:00 http://www.themis.iac.es/ http://www.themis.iac.es/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2025-01-17T13:00:25+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:building&rev=1737118825&do=diff THEMIS Building The iconic THEMIS building, with its cylindrical tower and closed spherical dome, has been build between 1993 and 1996. The THEMIS building specific design results from the need to maximise image quality. The THEMIS telescope is installed inside the upper part of a 22.5m long cylindrical tower. The frontal part of the telescope is closed by a sort of window which allows the telescope to be vacuum-sealed thus avoiding heavy temperature variations. A ~9m diameter dome protects th… text/html 2026-03-17T15:57:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:description&rev=1773763021&do=diff <font color="#ff0000" size="2.5"> Page in construction ; Last Update March 2026 </font> THEMIS technical description THEMIS is a versatile 92cm effective aperture Ritchey-Chrétien optical solar telescope that can be used in daylight for solar or bright objects observations, or at night for fainter objects. THEMIS handle the (extremely) wide range of available light energy flux through a dedicated light distribution detailed below. <font color="#ff9900">Text in orange indicates to interested TH… text/html 2025-11-14T12:39:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:ibis&rev=1763123980&do=diff THEMIS IBIS 2.0 Instrument The upgraded version of the Interferometric BIdimensional Spectrometer - IBIS 2.0 of the Italian National Institute for Astrophysics (INAF) - which was operated at the Dunn Solar Telescope of the National Solar Observatory from 2003 to 2019, shall be installed at the THEMIS telescope during the first half of 2026. This will mark the return of the Italian involvement in the THEMIS telescope. The spectral imaging capacities of IBIS 2.0 shall benefit from the <font s… text/html 2026-01-29T08:25:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:ibis2.0&rev=1769675149&do=diff THEMIS IBIS 2.0 Instrument The upgraded version of the Interferometric BIdimensional Spectrometer - IBIS 2.0 of the Italian National Institute for Astrophysics (INAF) - which was operated at the Dunn Solar Telescope of the National Solar Observatory from 2003 to 2019, shall be installed at the THEMIS telescope during the first half of 2026. This will mark the return of the Italian involvement in the THEMIS telescope. The spectral imaging capacities of IBIS 2.0 shall benefit from the <font s… text/html 2026-03-24T17:17:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:mtr2&rev=1774372653&do=diff THEMIS MulTi-Ray spectrograph (MTR2) MTR2 is the advanced version of the original MulTi-Ray spectrograph of THEMIS. MTR2 enables the production of high-spectral resolution spectrograms simultaneously in different wavelengths. This enables the study of different physical properties of the distinct layers of the solar atmosphere. <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=:science:gallery:schema:spectro_synoptic.png"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=:… text/html 2026-03-05T21:39:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:polarisation&rev=1772746755&do=diff Polarimetric analysis at THEMIS <font color="#ff0000" size="2.5"> Page in construction ; Last Update March 2026 </font> ---------- <font size="0.5"> © 2026 CNRS-THEMIS <br> Terms of use: unless otherwise specified, all graphical (webcam records, movies, pictures) or non-graphical material (text) from this site is property of CNRS-THEMIS under a <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons CC-BY 4.0 license</a>. text/html 2024-12-17T11:24:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:projects&rev=1734434653&do=diff THEMIS associated projects The THEMIS team is regularly associated with several international project and programmes. European Solar Telescope Design Study (EST/DS) The SOLARNET/I3 proposal AO project library IBIS 2.0 instrument @ THEMIS ---------- <font size="0.5"> © 2026 CNRS-THEMIS <br> Terms of use: unless otherwise specified, all graphical (webcam records, movies, pictures) or non-graphical material (text) from this site is property of CNRS-THEMIS under a <a href="https://creativec… text/html 2024-12-18T14:50:18+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.themis.iac.es/doku.php?id=technical:tao&rev=1734533418&do=diff Themis Adaptive Optics Themis Adaptive Optics (TAO) is a single conjugate adaptive optics (AO) system with only one deformable mirror conjugated to the lower atmospheric layers, responsible for most of the observed daytime turbulence at our site. TAO is inserted in the light path after the telescope and the transfer relay optics, between the (intermediate) F2' focus and the F2 focus at the spectrograph entry (Fig. 1). The TAO layout requires two horizontal folds of the beam, then returning…