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\begin{document}

\title{Energetic proton acceleration associated with Io's footprint tail}



\author[1]{George Clark}%
\author[2]{Barry H. Mauk}%
\author[3]{Peter Kollmann}%
\author[4]{Szalay R. Jamey}%
\author[5]{Ali H. Sulaiman}%
\author[6]{Daniel J Gershman}%
\author[7]{Joachim Saur}%
\author[7]{Sascha Janser}%
\author[6]{Katherine Garcia-Sage}%
\author[8]{Thomas K. Greathouse}%
\author[2]{Christopher P. Paranicas}%
\author[9]{Allegrini Frederic}%
\author[10]{Bagenal Fran}%
\author[9]{Scott J Bolton}%
\author[6]{John E. P. Connerney}%
\author[9]{ebert robert}%
\author[5]{George Blair Hospodarsky}%
\author[1]{Dennis K Haggerty}%
\author[9]{Vincent Hue}%
\author[5]{Masafumi Imai}%
\author[6]{Stavros Kotsiaros}%
\author[11]{mccomas David}%
\author[12]{Abigail Mary Rymer}%
\author[1]{Joseph Hinton Westlake}%
\affil[1]{Johns Hopkins University Applied Physics Laboratory}%
\affil[2]{Johns Hopkins University}%
\affil[3]{The Johns Hopkins University Applied Physics Laboratory}%
\affil[4]{Department of Astrophysical Sciences}%
\affil[5]{University of Iowa}%
\affil[6]{NASA Goddard Space Flight Center}%
\affil[7]{University of Cologne}%
\affil[8]{SWRI}%
\affil[9]{Southwest Research Institute}%
\affil[10]{Laboratory for Atmospheric and Space Phisics}%
\affil[11]{Department of Astrophysical Science}%
\affil[12]{Johns Hopkins Applied Physics Laboratory}%


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  \date{May 18, 2024}


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\selectlanguage{english}
\begin{abstract}
Observations of energetic charged particles associated with Io's
footprint (IFP) tail, and likely within or very near the Main Alfv\selectlanguage{ngerman}én
Wing, during Juno's 12th perijove (PJ) crossing show evidence of intense
proton acceleration by wave-particle heating. Measurements made by
Juno/JEDI reveal proton characteristics that include pitch angle
distributions concentrated along the upward loss cone, broad energy
distributions that span \textasciitilde{}50 keV to 1 MeV, highly
structured temporal/spatial variations in the particle intensities, and
energy fluxes as high as \textasciitilde{}100 mW/m2. Simultaneous
measurements of the plasma waves and magnetic field suggest the presence
of ion cyclotron waves and transverse Alfvénic fluctuations. We
interpret the proton observations as upgoing conics likely accelerated
via resonant interactions with ion cyclotron waves. These observations
represent the first measurements of ion conics associated with
moon-magnetosphere interactions, suggesting energetic ion acceleration
plays a more important role in the IFP tail region than previously
considered.%
\end{abstract}\selectlanguage{ngerman}%



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