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\begin{document}

\title{The Long Period of 3He-rich Solar Energetic Particles Measured by Solar
Orbiter 2020 November 17--23}



\author[1]{Radoslav Bucik}%
\author[2]{Glenn Mason}%
\author[3]{Raul Gomez-Herrero}%
\author[4]{David Lario}%
\author[5]{Laura Balmaceda}%
\author[6]{Nariaki Nitta}%
\author[7]{Vratislav Krupar}%
\author[8]{Nina Dresing}%
\author[2]{George Ho}%
\author[2]{Robert Allen}%
\author[3]{Fernando Carcaboso-Morales}%
\author[3]{Javier Rodriguez-Pacheco}%
\author[9]{Frederic Schuller}%
\author[9]{Alexander Warmuth}%
\author[10]{Robert Wimmer-Schweingruber}%
\author[10]{Johan Freiherr von Forstner}%
\author[2]{G Andrews}%
\author[10]{Lars Berger}%
\author[3]{Ignacio Cernuda}%
\author[3]{Francisco Espinosa Lara}%
\author[2]{W. Lees}%
\author[10]{Cesar Martin-Garcia}%
\author[10]{Daniel Pacheco}%
\author[3]{Manuel Prieto}%
\author[3]{Sebastian Sanchez Prieto}%
\author[2]{Charles Schlemm}%
\author[2]{Helmut Seifert}%
\author[11]{Kush Tyagi}%
\author[12]{Milan Maksimovic}%
\author[12]{Antonio Vecchio}%
\author[10]{Alexander Kollhoff}%
\author[10]{Patrick Kühl}%
\author[10]{Zigong Xu}%
\author[10]{Sandra Eldrum}%
\affil[1]{Southwest Research Institute}%
\affil[2]{Johns Hopkins University Applied Physics Laboratory}%
\affil[3]{University of Alcalá}%
\affil[4]{NASA Goddard Space Flight Center}%
\affil[5]{George Mason University Fairfax}%
\affil[6]{Lockheed Martin Advanced Technology Center}%
\affil[7]{University of Maryland Baltimore County}%
\affil[8]{University of Turku}%
\affil[9]{Leibniz Institute for Astrophysics Potsdam}%
\affil[10]{University of Kiel}%
\affil[11]{University of Colorado at Boulder}%
\affil[12]{LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris}%


\vspace{-1em}



  
  \date{May 22, 2024}


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\selectlanguage{english}
\begin{abstract}
We report observations of a relatively long period of 3He-rich solar
energetic particles (SEPs) measured by Solar Orbiter. The period
consists of several well-resolved ion injections. The high-resolution
STEREO-A imaging observations reveal that the injections coincide with
extreme ultraviolet jets and brightenings near the east limb, not far
from the nominal magnetic connection of Solar Orbiter. The jets
originated in two adjacent, large, and complex active regions, as
observed by the Solar Dynamics Observatory when the regions rotated into
the Earth's view. It appears that the sustained ion injections were
related to the complex configuration of the sunspot group and the long
period of 3He-rich SEPs to the longitudinal extent covered by the group
during the analyzed time period.%
\end{abstract}%



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