Ganymede-induced decametric emission: in-situ measurements by Juno.
- 1IRAP, Universit ́e de Toulouse, CNRS, CNES, UPS, Toulouse, France (corentin.louis@irap.omp.eu)
- 2Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, USA
- 3Southwest Research Institute, San Antonio, Texas, USA
- 4Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas, USA
- 5Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey, USA
At Jupiter, part of the auroral radio emissions are controlled by the Galilean moons Io, Europa and Ganymede. Until now, they have been remotely detected using ground-based radio-telescope or electric antenna aboard spacecraft. The polar trajectory of the Juno orbiter leads to cross the magnetic flux tube connected to these moons, or their tail, and gives a direct in-situ measurements of the characteristics of these decametric moon induced radio emissions (such as the electron population, size of the source, and beaming angle and growth rate of the emission). In this study, we focus on the crossing of the Ganymede flux tube. The study of Juno/JADE-E and Juno/Waves data leads to an estimated source size of a few 100s km, an electron population of energy E= 8±2 keV and an emission beaming angle of θ= 80±2° from the magnetic field lines. Finally, this crossing of a decametric radio emission induced by a moon brings us new constrains on the Cyclotron Maser Instability process
How to cite: Louis, C., Louarn, P., Kurth, W., Allegrini, F., and Szalay, J.: Ganymede-induced decametric emission: in-situ measurements by Juno., Europlanet Science Congress 2020, online, 21 Sep–9 Oct 2020, EPSC2020-763, https://doi.org/10.5194/epsc2020-763, 2020.
