THEMIS 2025 observing campaign shall last for about 100 days (dates to be announced). Incoming information will be posted here and on THEMIS webpage portal as soon as it becomes available.

The 2025 campaign shall observe the following schedule

• December 2024: opening of call to apply for observation time during the 2025 campaign. See bellow for how to apply.
• January 24th, 2025: proposal deadline for “Spanish time” observers
• TBD 2025: proposal deadline for “International time” observers
• February 17th, 2025: proposal deadline for “French time” observers
• March 2025: observation time allocation announced to applicants
• April-October 2025: observation campaign (at the exclusion of the month of August)
• Fall 2025: integration of the spectro-imaging IBIS 2.0 instrument

The detail observing calendar will be posted once the proposals selection has been made.

Use of the THEMIS telescope is granted by rights to the French and Spanish communities. Observation time is also possible to the international community through the CCI-ITP time allocation procedures. The International Scientific Committee (CCI) of the Instituto de Astrofisica de Canarias (IAC), overseeing the Canary Islands telescopes, awards observing time through its International Time Program (ITP). The time allocation is distributed as follow:

• Applicants to “French time”: 75% of the campaign, 75 days in 2025. Proposal for the French time are allocated by the THEMIS Time allocation Committee (TAC).
• Applicants to “Spanish time”: 20% of the campaign, 20 days for 2025. Proposal for the Spanish time are allocated by the Spanish TAC.
• Applicants to the “CCI time Solar ITP”: 5% of the total, or 5 days in 2025. Proposals for ITP time are allocated by the EAST-TAC, the joint European time allocation committee of the European Association for Solar Telescopes (EAST).

Interested researchers are encouraged to check the latest information on available THEMIS instrumentation and observing capacities, as well as the available data products.

Applicants, in particular if they are not familiar with THEMIS observations, are also encouraged to contact the THEMIS staff — in particular email Bernard GELLY or Etienne PARIAT —- directly to obtain more specific information or express their needs. Given the smaller amount of international time, interested international researchers can also contact the THEMIS staff to discuss possible joint campaign with French applicants, in case similar observation targets/mode are envisioned.

The submission of proposals is specific to the category of users one belongs, based on the above rules of access:

• French users: Please complete the LaTex application form and e-mail it to: bgelly@themis.iac.es. Application deadline is on February 17th, 2025.
• Spanish users should follow the instructions of the IAC solar CAT proposal system. Application deadline is on January 24th, 2025.
• CCI-ITP users: Please check on the Solarnet TNA page where applicants will find forms and information to apply to THEMIS. Those forms whall be mailed to: east-tac@astro.su.se Deadline is to be announced.

As soon as the appropriate proposal refereeing procedures of each community and TAC have been passed, applicants shall quickly be informed of their application outcomes.

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