THEMIS Solar Telescope
 » THEMIS Scientific objectives
Trace:
Show pageOld revsMedia Mngr
AdminLast ChgsMap

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
themis:science [2024/11/26 15:28] – etiennethemis:science [2024/12/11 14:35] (current) – etienne
Line 1: Line 1:
-===== THEMIS Scientific objectives (in construction) ===== +===== THEMIS Scientific objectives =====
- +
-The **THEMIS Solar Telescope** (Télescope Héliographique pour l’Étude du Magnétisme et des Instabilités Solaires/ **translate in english** ) primary scientific objectives center on studying the Sun's magnetic field and associated phenomena. Remarkably, THEMIS can also perform observation of near Sun objects such as Mercury and comets, in ways that are orthogonal and complementary to traditional planetary observations.+
  
 <columns 90% - > <columns 90% - >
 +The **THEMIS Solar Telescope** primary scientific objectives center on studying the Sun's magnetic field and associated phenomena. THEMIS name stands for "Télescope Héliographique pour l’Étude du Magnétisme et des Instabilités Solaires" (i.e. heliographic telescope for the study of magnetism and solar instabilities). THEMIS allows [[themis:science#Instrumental and technical objectives of THEMIS |high resolution solar spectropolarimetry]]. THEMIS is mainly aimed and designed for the [[themis:science#Solar physics science with THEMIS | study of the Sun]] and in particular to understand [[themis:science#Understanding Solar Magnetism|the solar magnetism]], as well as [[themis:science#Understanding Solar Heating|solar atmosphere heating]], [[themis:science#Study and follow Solar Activity |solar activity]] and the solar origin of [[themis:science#Help Understand Space Weather | space weather]].
 +Remarkably, THEMIS can also perform observation of near Sun objects such as [[themis:science#Planetary science with THEMIS |Mercury and comets]], in ways that are orthogonal and complementary to traditional planetary observations.
  
 +
 + 
 ==== Instrumental and technical objectives of THEMIS ==== ==== Instrumental and technical objectives of THEMIS ====
  
Line 10: Line 12:
  
 === High-Resolution Spectro-polarimetry & Spectroscopy === === High-Resolution Spectro-polarimetry & Spectroscopy ===
-The telescope specializes in **spectroscopy** and **spectropolarimetry**, analyzing the electromagnetic spectrum and the polarization of the light to infer multiple properties of the object that is observed, such as its composition, its physical caracteristics and its magnetic field.+The telescope specializes in **spectroscopy** and **spectropolarimetry**, analyzing the electromagnetic spectrum and the polarization of the light to infer multiple properties of the object that is observed, such as its composition, its physical characteristics and its magnetic field.
  
 THEMIS provides detailed information about the **[[themis:science#Understanding Solar Magnetism | Sun's magnetic field]]** in the lowest layers of the solar atmosphere (the photosphere and chromosphere), as well as around planets. THEMIS provides detailed information about the **[[themis:science#Understanding Solar Magnetism | Sun's magnetic field]]** in the lowest layers of the solar atmosphere (the photosphere and chromosphere), as well as around planets.
  
-THEMIS can realize a high spectral resolution observations and possess unique capabilities to measure the full Stokes parameters (the set of values that describe the polarization state of the light which is received by THEMIS), providing a complete characterization of the target magnetic field. Its design minimizes instrumental polarization, ensuring highly accurate measurements of magnetic field.+THEMIS can realize a high spectral resolution observations and possess unique capabilities to measure the full Stokes parameters (the set of values that describe the polarization state of the light which is received by THEMIS), providing a complete characterisation of the target magnetic field. Its design minimizes instrumental polarization, ensuring highly accurate measurements of magnetic field.
  
 === Reaching the telescope angular resolution limits thanks to adaptive optics === === Reaching the telescope angular resolution limits thanks to adaptive optics ===
 +
 +In construction
  
 ==== Solar physics science with THEMIS ==== ==== Solar physics science with THEMIS ====
Line 43: Line 47:
 In order answer these questions, THEMIS permits simultaneous multi-wavelength observations and the determination of the chromospheric magnetic field thanks to inversion of magnetic sensitive chromospheric lines such as He I and Ca II. In order answer these questions, THEMIS permits simultaneous multi-wavelength observations and the determination of the chromospheric magnetic field thanks to inversion of magnetic sensitive chromospheric lines such as He I and Ca II.
  
-=== Study of Solar Activity ===+=== Study and Follow Solar Activity ===
 THEMIS investigates transient events and dynamic processes in the Sun's atmosphere, including wave propagation, plasma flows, instabilities, and impulsively emitting features. THEMIS can observe small scale active events, such as bright points, Ellerman bombs, chromospheric jets, which are occurring in the low solar atmosphere and are emitting in photospheric and chromospheric lines to which THEMIS is design to observe. THEMIS also permits to observe the low-atmospheric response of larger coronal eruptions, such as the flares ribbons. THEMIS investigates transient events and dynamic processes in the Sun's atmosphere, including wave propagation, plasma flows, instabilities, and impulsively emitting features. THEMIS can observe small scale active events, such as bright points, Ellerman bombs, chromospheric jets, which are occurring in the low solar atmosphere and are emitting in photospheric and chromospheric lines to which THEMIS is design to observe. THEMIS also permits to observe the low-atmospheric response of larger coronal eruptions, such as the flares ribbons.
  
 By measuring the magnetic field that fuels solar activity, THEMIS provides insights both on the geometry of the magnetic field that stabilise large solar structures, as well as on the mechanisms and instabilities that can catastrophically destabilised them, leading to powerful solar eruptions. Either directly through spectropolarimetric imaging, or by spatially scanning a solar active region with spectroscopic slit, THEMIS can produce magnetic field maps that can be used as input for 3D reconstruction methods of the coronal magnetic field (i.e. magnetic extrapolations), enabling to access the 3D magnetic structures and study its link with eruptiveness. By measuring the magnetic field that fuels solar activity, THEMIS provides insights both on the geometry of the magnetic field that stabilise large solar structures, as well as on the mechanisms and instabilities that can catastrophically destabilised them, leading to powerful solar eruptions. Either directly through spectropolarimetric imaging, or by spatially scanning a solar active region with spectroscopic slit, THEMIS can produce magnetic field maps that can be used as input for 3D reconstruction methods of the coronal magnetic field (i.e. magnetic extrapolations), enabling to access the 3D magnetic structures and study its link with eruptiveness.
  
-=== Follow Solar Activity Cycle === +Finnaly, by monitoring long-term changes in solar magnetism, THEMIS contributes to understanding the solar cycle, including the 11-year activity cycle/22-year magnetic cycle and its impact on space weather. This research helps model how solar activity influences the Earth's magnetosphere and climate.
-By monitoring long-term changes in solar magnetism, THEMIS contributes to understanding the solar cycle, including the 11-year activity cycle/22-year magnetic cycle and its impact on space weather. This research helps model how solar activity influences the Earth's magnetosphere and climate.+
  
 === Help Understand Space Weather === === Help Understand Space Weather ===
Line 85: Line 88:
 </columns> </columns>
  
 +==== To go further ====
 +
 +[[:results|THEMIS results, highlights and news]] \\
 +[[themis:science:history| Historical THEMIS rationale]]
  
----- 
  
-<html> 
-<font size="0.5">  
-© 2024 CNRS-THEMIS <br> 
-Terms of use: unless otherwise specified, all graphical (webcam records, movies, pictures) or non-graphical material (text) from this site is property of CNRS-THEMIS: you are welcome in using any content provided that you properly cite its origin.</font> 
-</html> 
themis/science.1732634898.txt.gz · Last modified: 2024/11/26 15:28 by etienne
Show pageOld revs
BacklinksBack to top
Recent changes RSS feed Debian Powered by PHP Valid XHTML 1.0 Valid CSS Driven by DokuWiki