This is an old revision of the document!

THEMIS Solar Telescope

The “Télescope Héliographique pour l’Étude du Magnétisme et des Instabilités Solaires” (THEMIS) of CNRS-INSU is a 1-meter-class optical solar telescope, primarily dedicated to studying solar magnetism and the dynamical processes within the Sun’s atmosphere (such as sunspots and solar flares). THEMIS can also perform observation of near-Sun objects such as Mercury and comets.

THEMIS is located at the Teide Observatory of IAC, with a base office in La Laguna, in Tenerife, Canary Islands, Spain.

New: Preliminary schedule of 2025 observing campaign

Click for information on: How to reach THEMIS locations ; How to contact the THEMIS team

=== Overview of telescope status ===

THEMIS from VTT webcam

Webcam of THEMIS Dome

Latest EUMETSAT RGB image

THEMIS weather page

Last image from
THEMIS full Sun guider

=== The THEMIS telescope and its science === Technical & scientific information about THEMIS
THEMIS scientific objectives
THEMIS administrative structures

=== Observing with THEMIS === Information for research scientists wishing to observe with THEMIS
Weather at THEMIS location and weather forecast
THEMIS data products & data access

=== THEMIS Scientific research & results === Scientific research with THEMIS
THEMIS scientific highlights and news
THEMIS observations and media galleries

== THEMIS image of the month: March 2025 ==

THEMIS observations of the east sunspot group of the active region NOAA 13981 on February 6th 2025. The left image is a Knox-Thompson reconstructed from red continuum broadband camera. The right panels are intensity maps reconstructed from spectral observations by the MTR2 spectrograph observing the Hα absorption line. Theses maps are reconstructed from a scan by the telescope of the active region. While these intensity images have a lower spatial resolution, they provide a wealth of spectroscopic information. The region was observed during a flare, as can be noted by the typical ribbon-shape emission in the Hα line centre. This emission is absent from the continuum emission, indicating a chromospheric emission phenomena. Meanwhile, the red wing maps (Hα+1Å and Hα+0.5Å) display dark absorbing material above the location of the flare ribbons, signature of down-flowing dense material, a phenomena nicknamed “coronal rain”.

Past images of the month

=== THEMIS telescope management === Internal pages for the THEMIS team
Previous THEMIS front page