Magnetic Field Observations During the Juno Spacecraft’s Close Passages of Io

The Juno spacecraft, in extended mission, explores the environments of the Galilean satellites as it passes through Jupiter’s equator plane prior to periJove. Two close passages of Io with a minimum altitude of ~1500 km were targeted to occur on orbits 57 and 58, providing a wealth of information on Io’s interior (gravity), geologic processes, atmosphere, and interaction with Jupiter’s magnetosphere. Juno’s magnetometer investigation samples the vector magnetic field in Io’s vicinity at 64 samples/s. Here we discuss Io’s interaction with the Jovian magnetosphere and the detection of ion cyclotron waves at ~0.5 Hz, ~1 Hz, and ~2 Hz, associated with Io-genic SO2, S, and O.