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| science:imofmonth [2025/11/07 10:16] – etienne | science:imofmonth [2026/01/29 15:26] (current) – etienne |
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| ===== Images of the month ===== | ===== Images of the month ===== |
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| | === January 2026 === |
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| | <columns 100% l > |
| | <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:instrumentation:themis_enrouleurcables.jpg |
| | "> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:instrumentation:themis_enrouleurcables.jpg |
| | " alt="THEMIS cable reel" style="width: 50%; height: auto;"></a></html> \\ |
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| | Because of the height of the THEMIS spectrograph, about 50 meters of cables are needed to connect the THEMIS control room with the different systems of the telescope and its instrumentation. These cables are used to power the mount and the different motors, to send commend to the telescope and to receive housekeeping and scientific data. This image of the month presents THEMIS cable reel and ill-known although fundamental element for the operations of THEMIS. A specificity of THEMIS is that the whole THEMIS instrumentation hangs under the THEMIS mount and rotates with it as the telescope tracks the Sun. THEMIS cable reel, located at the 4th floor of the THEMIS building permits to avoid the tearing out of the cables as the telescope rotate. About 6 meters of cable length are "stored" within it, compensating the lengthening of the distance as THEMIS moves. |
| | </columns> |
| | |
| | === December 2025 === |
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| | <columns 100% l > |
| | <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:ar:stokesmap_noaa14100.jpg |
| | "> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:ar:stokesmap_noaa14100.jpg |
| | " alt="Stokes maps of active region 14100" style="width: 50%; height: auto;"></a></html> \\ |
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| | 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. |
| | \\ |
| | </columns> |
| | |
| | === November 2025 === |
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| | <columns 100% l > |
| | <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:results:ibis_1stscrew_03.jpg |
| | "> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:results:ibis_1stscrew_03.jpg |
| | " alt="IBIS 2.0 Optical Bench" style="width: 30%; height: auto;"></a></html> \\ |
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| | IBIS 2.0 is coming! During a preparatory visit at THEMIS, the INAF Italian team of the [[https://www.ibis20.inaf.it/| Interferometric BIdimensional Spectrometer - IBIS 2.0]] has started to assemble the first pieces of the optical bench of IBIS 2.0. An alternative beam path provided by THEMIS, located after its adaptive optics, will exit the THEMIS spectrograph hull and feed IBIS 2.0, which will be mounted vertically on THEMIS. The upgraded version of IBIS 2.0 shall be fully installed on the optical bench shown in the picture during the spring of 2026. IBIS 2.0 will be an outstanding synergic complement of THEMIS long slit spectrograph MTR2, enhancing THEMIS competitiveness in the 1-1.5m solar telescope category, providing new strong scientific capabilities to study the dynamics of the low solar atmosphere. |
| | \\ |
| | </columns> |
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| === October 2025 === | === October 2025 === |
