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| <color red > ** New :** </color> | <color red > ** New :** </color> [[science:results:SeminLPP | October : Seminar on THEMIS at the Plasma Physics Laboratory, Paris (FR).]] \\ |
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| [[science:resources | Downloadable posters highlighting recent high-resolution observations of solar active regions by THEMIS]]\\ | [[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).]] \\ | |
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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: July 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:instrumentation:spectro_with_light.png"> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:instrumentation:spectro_with_light.png" alt="A peek inside THEMIS MTR2 spectrograph" style="width: 40%; height: auto;"></a></html> \\ | <columns 100% l 40> |
| | <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:instrumentation:themisthroughoculus.jpg |
| | "> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:instrumentation:themisthroughoculus.jpg |
| | " alt="THEMIS telescope through the dome oculus" style="width: 100%; height: auto;"></a></html> \\ |
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| <newcolumn 40%> | 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. |
| If one could sneak inside [[technical:mtr2 | MTR2 spectrograph]] while THEMIS is observing, this is what one would see looking down. The picture shows the beautiful work of decomposing the white solar light into small ranges of electromagnetic spectrum that are of interest for researchers to study the physical properties of the Sun. \\ | |
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| The white light beam coming from the THEMIS telescope (white light on the left) is first decomposed in a low resolution spectrum (rainbow on the middle left). A rigid mask placed on the light path, enables to select several bands within the solar spectrum that will be analysed (overlapping orange and red patch on the middle right). Finally, an echelle grating enables to strongly increase the dispersion (spacing) of the spectral domains of interest (separated and extended red and orange patch on the right). There spectral cameras are placed to record the high resolution spectrum. | |
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| With its a spectral resolving power, R, of about 200 000-300 000, THEMIS MTR2 spectrograph has one of the world's best resolving power in astrophysics. MTR2 has the ability to distinguish between two wavelengths separated by a small amount. THEMIS theoretical can produce simultaneously up to eight high resolution spectrograms (although most cases, only 2-4 are requested). The choice of wavelength domains is not pre-imposed to the visiting research scientist observing with THEMIS. The choice is left to the investigators, giving them a high level of freedom to study [[https://www.themis.iac.es/doku.php?id=science:objectives | diverse topics in solar physics]]. | |
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