| Both sides previous revisionPrevious revisionNext revision | Previous revision |
| themis [2026/01/28 16:56] – etienne | themis [2026/02/13 17:23] (current) – etienne |
|---|
| /* | /* |
| ;#; | ;#; |
| <color red > 2025 campaign schedule ** ¡¡¡ Call for the [[observation:2025campaign | 2025 observing campaign]] is open !!! ** \\ | <color red > ** ¡¡¡ Call for the [[observation:2026campaign | 2026 observing campaign]] is open !!! ** \\ |
| Deadline for "French" and "International" time" : February 17th, 2026. </color> \\ | Deadline for "French" and "International" time" : February 13th, 2026. </color> \\ |
| | <del> Deadline for "Spanish" time" : January 21st, 2026. </del> |
| ;#; | ;#; |
| */ | */ |
| |
| ;#; | <html><b> February : The THEMIS team supports the call to French research personnel to <a href="https://atst.osups.universite-paris-saclay.fr/est-white-paper/" style="color:#FF0000;"> co-sign the white paper in support to the European Solar Telescope (EST) project (click here) </a></b></html> |
| <color red > ** ¡¡¡ Call for the [[observation:2026campaign | 2026 observing campaign]] is open !!! ** \\ | |
| Deadline for "French" and "International" time" : February 13th, 2026. \\ | |
| Deadline for "Spanish" time" : January 21st, 2026. </color> | |
| ;#; | |
| |
| | /*[[https://atst.osups.universite-paris-saclay.fr/est-white-paper/ | February : The THEMIS team supports the call to French research personnel to co-sign the « White paper on the relevance of the European Solar Telescope (EST) for the French heliophysics community »]] */ |
| |
| | [[science:results:OFRAMEdays2026 | February : Participation of THEMIS at the "OFRAME space weather days 2026" conference in Grenoble (FR).]] \\ |
| | [[science:results:Jorgearrival | January : One year visit at THEMIS of PhD student Jorge Romero Castañeda (LPP) in the context of the ANR JET2SB project.]] \\ |
| [[science:results:KISmeeting | January : Presentation of THEMIS and IBIS at the "Methods and techniques for high-resolution spectro-polarimetry" conference in Freiburg (GER).]] \\ | [[science:results:KISmeeting | January : Presentation of THEMIS and IBIS at the "Methods and techniques for high-resolution spectro-polarimetry" conference in Freiburg (GER).]] \\ |
| ** [[science:results:IBISNov25 | November : First screw of the Italian IBIS 2.0 Spectro-imager @ THEMIS.]] ** \\ | ** [[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]] \\ | |
| |
| 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]]** |
| **[[science| Scientific research with THEMIS]]** \\ | **[[science| Scientific research with THEMIS]]** \\ |
| [[science:results| THEMIS scientific highlights and news]] \\ | [[science:results| THEMIS scientific highlights and news]] \\ |
| [[science:gallery| THEMIS observations and media galleries]] | [[science:gallery| THEMIS observations and media galleries]] \\ |
| | [[science:resources | Media resources (Posters, logos, ...)]] |
| |
| |
| == THEMIS image of the month: December 2025 == | == THEMIS image of the month: January 2026 == |
| |
| |
| <columns 100% l 60> | <columns 100% l 40> |
| <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:ar:stokesmap_noaa14100.jpg | <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:ar:stokesmap_noaa14100.jpg | "> <img src="https://www.themis.iac.es/lib/exe/fetch.php?media=science:gallery:instrumentation:themis_enrouleurcables.jpg |
| " alt="Stokes maps of active region 14100" style="width: 100%; height: auto;"></a></html> \\ | " alt="THEMIS cable reel" style="width: 100%; height: auto;"></a></html> \\ |
| |
| <newcolumn 40%> | <newcolumn 60%> |
| \\ | \\ |
| \\ | 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. |
| \\ | |
| \\ | |
| \\ | |
| 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> | </columns> |
| | |
| |
| |
