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\title{Viability of the early JUICE flyby trajectories to confirm ocean existence at Ganymede}



\author[1]{Shivangi Sharan}%
\author[1]{Michele K Dougherty}%
\author[1]{Adam Masters}%
\author[1]{Ciaran Jones}%
\author[1]{Matthew Acevski}%
\affil[1]{Department of Physics, Blackett Laboratory, Imperial College London}%


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  \date{May 17, 2024}


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\begin{abstract}
Ganymede is the largest moon in our Solar System, and unique in
producing its own magnetic field, as well as possibly possessing a
subsurface ocean. The measurements from the only spacecraft that visited
the moon, Galileo, provided two models for the internal field- a dipole
and quadrupole model or a dipole and induction model. The focus of the
initial 3 close flybys of the JUpiter ICy moons Explorer (JUICE) mission
is to differentiate between the two signals and confirm the existence of
an ocean. We begin with an analysis of the JUICE and Galileo
trajectories in different reference frames and predict the induction
signal using the time-varying field of Jupiter. A comparison between the
induction and quadrupole signatures for Galileo flybys shows that the
former seems more likely. Finally, we present and discuss the importance
of the 3 JUICE flybys to observe the induction field and hence confirm
the ocean.%
\end{abstract}%



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