Berghmans, D. ; Antolin, P. ; Auchère, F. ; Barczynski, K. ; Aznar Cuadrado, R. ; Chitta, L. P. ; Gissot, S. ; Harra, L. ; Janvier, J. ; Kraaikamp, E. ; Long, L. ; Mierla, M. ; Parenti, S. ; Rodriguez, L. ; Schühle, U. ; Stegen, K. ; Verbeeck, F. ; Zhukov, A. ; EUIteam, X.

Talk presented at Solar Orbiter 8, Belfast (UK) on 2022-09-12

Abstract: The Extreme Ultraviolet Imager (EUI), onboard Solar Orbiter, consists of 3 telescopes, the Full Sun Imager (FSI) and the High Resolution Imagers in EUV (HRIEUV) and in Lyman- alpha (HRILYA). Solar Orbiter/EUI started its Nominal Mission on 2021 November 27. EUI is imaging from the largest scales in the extended corona off limb, down to the smallest features at the base of the corona and chromosphere. EUI is therefore a cornerstone instrument for the connection science that is at the heart of the Solar Orbiter science goals. The highest spatial resolution of EUI is achieved when Solar Orbiter passes through the perihelion of its orbit. On 2022 March 26, Solar Orbiter reached for the first time a distance to the Sun of only 0.323 au. No other coronal EUV imager but EUI came ever this close to the Sun. In this paper, we review the obtained EUI data sets during the period 2022 March-April, when Solar Orbiter quickly moved from alignment with the Earth (2022 March 6), to perihelion (2022 March 26), to quadrature with the Earth (2022 March 29). We will highlight the first observational results in these unique data-sets and we report on the in-flight instrument performance. EUI has achieved the highest resolution images ever of the solar corona in the quiet Sun and polar coronal holes. Several active regions were imaged at unprecedented cadences and sequence durations. We identified in this paper a broad range of features that require deeper studies. For each telescope we report also pending performance issues. We conclude with an invitation to participate in the EUI research by make use of the EUI open data policy and the EUI Guest Investigator Program.

Keyword(s): Solar Orbiter ; EUI
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