Articles | Volume 31, issue 1
Ann. Geophys., 31, 45–59, 2013
Ann. Geophys., 31, 45–59, 2013

Regular paper 07 Jan 2013

Regular paper | 07 Jan 2013

ULF waves in Ganymede's upstream magnetosphere

M. Volwerk1, X. Jia2, C. Paranicas3, W. S. Kurth4, M. G. Kivelson5, and K. K. Khurana5 M. Volwerk et al.
  • 1Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria
  • 2Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, USA
  • 3The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
  • 4Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
  • 5Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA, USA

Abstract. Ganymede's mini-magnetosphere, embedded in Jupiter's larger one, sustains ULF (ultra-low frequency) waves that are analyzed here using data from two Galileo flybys that penetrate deeply into the upstream closed field line region. The magnetometer data are used to identify field line resonances, magnetopause waves and ion cyclotron waves. The plasma densities that are inferred from the interpretation of these waves are compared with the observations made by other plasma and wave experiments on Galileo and with numerical and theoretical models of Ganymede's magnetosphere.