====== THEMIS Solar Telescope ====== The "Télescope Héliographique pour l’Étude du Magnétisme et des Instabilités Solaires" (THEMIS) of [[https://www.insu.cnrs.fr/en|CNRS-INSU]] is a 1-meter-class optical solar telescope, primarily dedicated to studying solar magnetism and the dynamical processes within the Sun’s atmosphere (such as sunspots and solar flares). THEMIS can also perform observation of near-Sun objects such as Mercury and comets. THEMIS is located at the [[https://www.iac.es/en/observatorios-de-canarias/teide-observatory | Teide Observatory]] of [[https://www.iac.es/en | IAC]], with a base office in La Laguna, in Tenerife, Canary Islands, Spain. /* ;#; 2025 campaign schedule ** ¡¡¡ Call for the [[observation:2025campaign | 2025 observing campaign]] is open !!! ** \\ Deadline for "French" and "International" time" : February 17th, 2026. \\ ;#; */ ;#; ** ¡¡¡ Call for the [[observation:2026campaign | 2026 observing campaign]] is open !!! ** \\ Deadline for "French" and "International" time" : February 13th, 2026. \\ Deadline for "Spanish" time" : January 21st, 2026. ;#; ** November : [[science:results:IBISNov25 | First screw of the Italian IBIS 2.0 Spectro-imager @ THEMIS.]] ** \\ November: [[science:results:SeminIAC25 | Seminar on THEMIS at the Instituto de Astrofísica de Canarias, La Laguna (ES).]] \\ [[science:resources | Downloadable posters highlighting recent high-resolution observations of solar active regions by THEMIS]] \\ Click for information on: \ \ **[[admin:location| How to reach THEMIS locations]]** \ ; \ **[[admin:contacts| How to contact the THEMIS team]]** /* STANDARD PIC */ /*

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*/ === Overview of telescope status ===

\\ [[http://themis.iac.es/wdata/Webcam/webcam.jpg | THEMIS from VTT webcam]]

\\ [[http://themis.iac.es/wdata/Webcam/Domecam.jpg | Webcam of THEMIS Dome]]

\\ Latest [[https://view.eumetsat.int/productviewer?v=default | EUMETSAT]] RGB image

\\ [[observation:weather | THEMIS weather page]]

\\ Last image from \\ THEMIS full Sun guider ---- === The THEMIS telescope and its science === **[[technical|Technical & scientific information about THEMIS]]** \\ [[science:objectives|THEMIS scientific objectives]] \\ [[admin|THEMIS administrative structures]] === Observing with THEMIS === **[[observation| Information for research scientists wishing to observe with THEMIS]]** \\ [[observation:2026campaign | 2026 observing campaign]] \\ [[observation:weather | Weather at THEMIS location and weather forecast]] \\ [[observation:data| THEMIS data products & data access]] === THEMIS Scientific research & results === **[[science| Scientific research with THEMIS]]** \\ [[science:results| THEMIS scientific highlights and news]] \\ [[science:gallery| THEMIS observations and media galleries]] == THEMIS image of the month: December 2025 ==

\\ \\ \\ \\ \\ \\ Measuring magnetic field signature in the solar atmosphere is the "raison d'être" of THEMIS. Since its renovation, the THEMIS team has had as a main objective of producing vector magnetograms (maps of the magnetic field vector) while observing with the [[technical:tao|THEMIS adaptive optics (TAO)]]. This December 2025 image of the month, presents one of the ultimate steps toward this goal, presenting the so-called [[https://en.wikipedia.org/wiki/Stokes_parameters | Stokes maps]] that describe the polarisation of the light. The figure shows that in the centre of the Fe I line (at 630,1 nm) a strong polarization signal is captured by the spectropolarimetric measurement of THEMIS in active region NOAA 14100, obtained in May, indicating of the presence of magnetic field. In the continuum near that line, no polarisation signal is observed, confirming the absence of polarisation contamination in THEMIS light path. From such Stokes map, a magnetic inversion code shall then be used to determine the magnetic fields that could induce these light polarization signal, and thus produce magnetograms with TAO. [[science:imofmonth|Past images of the month]] === THEMIS telescope management === [[management|Internal pages for the THEMIS team]]\\ [[oldstart|Previous THEMIS front page]]