Introduction

The Extreme Ultraviolet Imager (EUI) is part of the remote sensing instrument package of the ESA/NASA Solar Orbiter mission. EUI aims at improving scientific understanding of the structure and dynamics of the solar atmosphere, globally as well as at high resolution, and from high solar latitude perspectives. EUI consists of 3 telescopes that are optimized to image in Lyman-α and EUV (17.4 nm, 30.4 nm) to provide a coverage from chromosphere up to corona.

EUI News

News

5 years of EUI magic

2025/05/12 - 14:43

May 12, 2020 - The 3 telescopes of the Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter opened their doors to capture images of the Sun.

Solar Orbiter Workshop at the SIDC

2025/04/17 - 15:14

On 8, 9 and 10 April 2025, the SIDC welcomed 85 leading solar physicists, in person and online, to participate in an international workshop on the future of the ESA/NASA Solar Orbiter mission.

Solar poles coming into view

2025/03/20 - 22:28

The EUI telescope on Solar Orbiter is getting its first glimpses of the poles of the Sun.

Call for Guest Investigators

2024/08/29 - 14:22

Once more, the solar physics team of the Royal Observatory of Belgium invites external researchers to join in the data exploitation of its space telescopes on the PROBA2 microsatellite (SWAP, LYRA) and on Solar Orbiter (EUI).

Spot the moss, spicules, and coronal rain

2024/05/03 - 11:03

The EUI instrument onboard Solar Orbiter observed the solar corona in exquisite detail once more.

New Guest Investigator Call: visit the EUI and SWAP/LYRA PI teams in Brussels in 2024!

2023/09/12 - 13:22

The EUI and SWAP/LYRA PI teams welcome research proposals for the 2024 round of its Guest Investigator Program for research based on EUI, SWAP or LYRA data.

Solar Orbiter Discovers Tiny Jets That Could Power the Solar Wind

2023/08/25 - 17:28

ESA’s Solar Orbiter spacecraft has discovered a multitude of tiny jets of material escaping from the Sun’s outer atmosphere. Each jet lasts for between 20 and 100 seconds, and expels plasma at around 100 km/s. These jets could be the long-sought-after source of the ‘solar wind’.

High frequency magnetic waves on the sun

Heat waves on the Sun

2023/07/25 - 13:24

A joint scientific team led by the Royal Observatory of Belgium (ROB) and the KU Leuven has found that high-frequency magnetic waves could play an essential role in keeping the Sun’s atmosphere at millions of degrees. This finding sheds a new light on the most intriguing solar mystery: what makes the Sun’s atmosphere hotter than its surface?