Science Requirement Document (SRD) for the European Solar Telescope (EST) (3rd Edition, December 2025)
Rolf Schlichenmaier (1), Luis R. Bellot Rubio (2), Manuel Collados Vera (3, 4), Robertus Erdelyi (5, 6, 28), Alex Feller (7), Lyndsay Fletcher (8, 13), Jan Jur\v{c}\'ak (9), Elena Khomenko (3), Jorrit Leenaarts (10), Sara Matthews (11), Luca Belluzzi (12, 1), Mats Carlsson (13

TL;DR
This paper presents the third edition of the Science Requirement Document for the European Solar Telescope, detailing recent design developments, instrumentation capabilities, and updated observing programmes aligned with scientific goals.
Contribution
It provides a comprehensive revision of the SRD incorporating new instrument designs, multi-wavelength observation capabilities, and updated scientific objectives for the EST project.
Findings
Development of advanced multi-wavelength instruments
Updated observing programmes aligned with new instrument capabilities
Passage of all telescope subsystems and instruments through design reviews
Abstract
The European Strategy Forum on Research Infrastructures (ESFRI) included the European Solar Telescope (EST) as an ESFRI Project in its 2016 Roadmap and confirmed this status in 2021. During the Preparatory Phase (2017 to 2022), the EST Science Advisory Group (SAG) was established in 2017. Its first task was to revise the Science Requirements Document (SRD), originally formulated in 2011. This second edition of the SRD was published in December 2019 (Schlichenmaier et al. 2019, 2019arXiv191208650S). Since 2019, the EST Project Office has advanced the telescope design and developed the Science Instrumentation Suite (SIS). All telescope subsystems and the SIS have now passed their Design Reviews. Aligned with the discussions and resolutions of the SAG, the SIS comprises three categories of first-generation instruments: (1) Tunable Imaging Spectropolarimeters coupled with Fixed Band…
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Taxonomy
TopicsSolar and Space Plasma Dynamics
