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| <color red > News </color>\\ | <color red > ** New :** </color> [[science:results:SeminLPP | October : Seminar on THEMIS at the Plasma Physics Laboratory, Paris (FR).]] \\ |
| [[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).]] \\ | [[science:resources | Downloadable posters highlighting recent high-resolution observations of solar active regions by THEMIS]]\\ |
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| Click for information on: \ \ **[[admin:location| How to reach THEMIS locations]]** \ ; \ **[[admin:contacts| How to contact the THEMIS team]]** | Click for information on: \ \ **[[admin:location| How to reach THEMIS locations]]** \ ; \ **[[admin:contacts| How to contact the THEMIS team]]** |
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| === Observing with THEMIS === | === Observing with THEMIS === |
| **[[observation| Information for research scientists wishing to observe with THEMIS]]** \\ | **[[observation| Information for research scientists wishing to observe with THEMIS]]** \\ |
| **[[observation:2025campaign#2025 campaign schedule | Schedule of 2025 observing campaign]]** \\ | [[observation:2025campaign | 2025 observing campaign]] \\ |
| [[observation:weather | Weather at THEMIS location and weather forecast]] \\ | [[observation:weather | Weather at THEMIS location and weather forecast]] \\ |
| [[observation:data| THEMIS data products & data access]] | [[observation:data| THEMIS data products & data access]] |
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| == THEMIS image of the month: June 2025 == | == THEMIS image of the month: October 2025 == |
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| <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:protu:solarfilament_meteospace_2025june05.jpg"> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:protu:solarfilament_meteospace_2025june05.jpg" alt="Solar filament observations on June 5th 2025." style="width: 100%; height: auto;"></a></html> \\ | |
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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.\\ | <columns 100% l 40> |
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| 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.\\ | <newcolumn 60%> |
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| 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. \\ | |
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| 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. | A view of the THEMIS telescope in its resting safe position seen through the oculus of the dome. The THEMIS dome was designed not only to protect the telescope from inclement weather, but also to avoid direct sunlight heating the floor around the telescope mount. Such heat induces turbulence that can significantly impact the quality of the observations. In order for THEMIS to observe, the oculus has precisely the size of the telescope aperture. While observing the only sunlight that gets in the dome goes in the telescope. Both the telescope and the oculus must then move smoothly and synchronously when tracking the Sun during its diurnal motion. |
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