ULF waves in Ganymede's upstream magnetosphere

Volwerk, M.; Jia, X.; Paranicas, C.; Kurth, W. S.; Kivelson, M. G.; Khurana, K. K.

doi:https://doi.org/10.5194/angeo-31-45-2013

Articles | Volume 31, issue 1

Ann. Geophys., 31, 45–59, 2013

https://doi.org/10.5194/angeo-31-45-2013

© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Ann. Geophys., 31, 45–59, 2013

https://doi.org/10.5194/angeo-31-45-2013

© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 31, issue 1

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.

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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

Received: 24 Sep 2012 – Revised: 03 Dec 2012 – Accepted: 05 Dec 2012 – Published: 07 Jan 2013

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.