The EUI data policy

The EUI consortium is committed to a maximally open data policy meaning that all data products, low latency data products, the calibration software and science user documentation will be made available as soon as possible and as broadly as possible. This implies specifically that the EUI consortium will not ex- ercise the right foreseen in the Solar Orbiter Management Plan (Solar Orbiter 2012) to retain the data private during 3 months after the receipt of the original telemetry for the purpose of cal- ibration and verification. Instead, the EUI data products will be distributed as soon as is technically possible with the best known calibration at the time of production.

The full EUI data archive will be reprocessed on a regular ba- sis to apply the continuously improving instrument understand- ing and calibration optimisation. Each such reprocessing will be distributed as a new release of the data. Typically only Level 2 data will be upgraded in a new release. Level 0 data will never change by definition. Level 1 data will only be upgraded if the metadata content is changing. Level 3 data will only upgrade if the changes imply a visually perceptible change. Previous ver- sions of the data, corresponding to old releases, will continue to be available for reproducibility of past research.

All EUI science data will be available from the EUI Data Centre and from the Solar Orbiter Archive (SOAR). EUI science data will be further propagated through Virtual Observa- tories (Rouillard et al. 2019) and online visualisation platforms such as JHelioviewer (Müller et al. 2017).