====== 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.
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2025 campaign schedule ** ¡¡¡ Call for the [[observation:2025campaign | 2025 observing campaign]] is open !!! ** \\
Deadline for "French" and "International" time" : February 17th, 2025.
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** New :**
[[science:resources | Downloadable posters highlighting recent high-resolution observations of solar active regions by THEMIS]]\\
[[science:results:ESTFrance2025 | June : Presentation of THEMIS results at the EST France 2025 Workshop in Paris (FR).]] \\
[[science:results:SF2A2025 | July : Presentation of THEMIS results at the "Journées de la SF2A" in Toulouse (FR).]] \\
Click for information on: \ \ **[[admin:location| How to reach THEMIS locations]]** \ ; \ **[[admin:contacts| How to contact the THEMIS team]]**
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=== Overview of telescope status ===
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[[http://themis.iac.es/wdata/Webcam/webcam.jpg | THEMIS from VTT webcam]]
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[[http://themis.iac.es/wdata/Webcam/Domecam.jpg | Webcam of THEMIS Dome]]
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Latest [[https://view.eumetsat.int/productviewer?v=default | EUMETSAT]] RGB image
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[[observation:weather | THEMIS weather page]]
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Last image from \\
THEMIS full Sun guider
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=== 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:2025campaign#2025 campaign schedule | Schedule of 2025 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: June 2025 ==
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In June, during an observation campaign lead by researchers from the Paris Observatory (France) and the University of Wroclaw (Poland), THEMIS observed solar filaments. Solar filaments are large magnetised structure of the solar corona confining cold chromospheric-like plasma. Thanks to its specific magnetic structure, solar filaments plasma, of a temperature of about 10 000°K, "hangs" thermally isolated from the million °K solar corona. As this dense and cool plasma absorbs the light emitted from the lower solar layer, the filament appears dark relatively to the background.\\
The THEMIS observation presented here results from two reconstructed images obtained from two adjacent scans over the solar filament with the THEMIS spectrograph slit. The two scans, which have a 80" range with a 0.5" spatial step, are then stitched together to obtain a larger field of view of about 110" x 90". Only the reconstructed image in the core of Hα line is displayed here, but THEMIS data allow to sample the full range of the Hα line with a spectral resolution of 4mÅ.\\
THEMIS high-resolution observations are very complementary to the observations of the [[https://www.oca.eu/fr/lag-physol-projects?option=com_content&view=category&layout=blog&id=295&Itemid=908 | Meteospace/3SOLEIL]] solar surveillance service of OCA/CNRS-INSU, which provide full-Sun high cadence (every 10s) Hα observations, presented on the right panel. \\
Thanks to its high-resolution, as illustrated in the left panel, THEMIS permits to analyse the filamentary structure of the solar filament and understand its magnetic field thanks to THEMIS polarised measurements. In particular, the magnetic properties of the "barbs" of the filament, the features which extend away from the "spine" (the filament axis), remains ill understood and an active topic of research.
[[science:imofmonth|Past images of the month]]
=== THEMIS telescope management ===
[[management|Internal pages for the THEMIS team]]\\
[[oldstart|Previous THEMIS front page]]
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