Field line resonances in Ganymede’s magnetosphere observed by Juno
- 1Planetary Magnetospheres Laboratory, NASA Goddard Space Flight Center, Greenbelt, United States of America (yasmina.martos@nasa.gov)
- 2Department of Astronomy, University of Maryland College Park, United States of America
- 3Space Research Corporation, Annapolis, United States of America
- 4Technical University of Denmark, Denmark
On June 7, 2021 Juno performed a close flyby of Ganymede. Here we study the high-resolution magnetic field spectrum which indicates that Juno travelled within Ganymede’s closed magnetic field line region for around 3 minutes during the closest approach. This result is supported by two main facts. 1) The harmonic structure in the spectrum of the high-resolution magnetometer data agrees very well with the frequencies predicted for resonances of a dipole field. 2) The inferred plasma density near the equator at 1.7 RG (L-shell of the closest approach) is approximately 25 amu/cm3, which is much lower than the local density of the plasma sheet near Ganymede (~100 amu/cm3). We also discuss our results together with those obtained by other Juno instruments and theoretical models.
How to cite: Martos, Y. M., Romanelli, N., Espley, J., Connerney, J., and Kotsiaros, S.: Field line resonances in Ganymede’s magnetosphere observed by Juno, Europlanet Science Congress 2022, Granada, Spain, 18–23 Sep 2022, EPSC2022-719, https://doi.org/10.5194/epsc2022-719, 2022.
