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| themis [2025/12/16 11:08] – etienne | themis [2026/01/28 16:56] (current) – etienne |
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| <color red > ** November : ** </color> ** [[science:results:IBISNov25 | First screw of the Italian IBIS 2.0 Spectro-imager @ THEMIS.]] ** \\ | [[science:results:KISmeeting | January : Presentation of THEMIS and IBIS at the "Methods and techniques for high-resolution spectro-polarimetry" conference in Freiburg (GER).]] \\ |
| November: [[science:results:SeminIAC25 | Seminar on THEMIS at the Instituto de Astrofísica de Canarias, La Laguna (ES).]] \\ | ** [[science:results:IBISNov25 | November : First screw of the Italian IBIS 2.0 Spectro-imager @ THEMIS.]] ** \\ |
| [[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]] \\ |
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| <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=observatorio_del_teide_daniel_lopez-6_sm.jpg"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=observatorio_del_teide_daniel_lopez-6_sm.jpg" style="width:90%; height: auto;"></a></html> | /* STANDARD PIC */ |
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| == THEMIS image of the month: November 2025 == | == THEMIS image of the month: December 2025 == |
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| <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:results:ibis_1stscrew_03.jpg | <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:results:ibis_1stscrew_03.jpg | "> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:ar:stokesmap_noaa14100.jpg |
| " alt="IBIS 2.0 Optical Bench" style="width: 100%; height: auto;"></a></html> \\ | " alt="Stokes maps of active region 14100" style="width: 100%; height: auto;"></a></html> \\ |
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| IBIS 2.0 is coming! \\ | \\ |
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| 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. | 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. |
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