Plasma flow in the magnetosphere of Ganymede

Aharon Eviatar, Andrew F. Cheng, Chris Paranicas, Barry H. Mauk, Richard W. McEntire, Donald J. Williams

Research output: Contribution to journalArticlepeer-review


Galileo Energetic Particles Detector (EPD) measurements indicate that convective flow speeds near Ganymede decrease to less than one-third of rigid corotation well before any significant increase in the magnetic field strength along the trajectory is observed. In an Alfven wing model, such a deceleration implies that the Ganymede magnetosphere is a conducting object. We assess the magnitude of various conductivities and find that closure of the Alfven wing current is attainable only through the body of Ganymede itself. We discuss briefly the planetological implications of this magnetospheric result.

Original languageEnglish
Pages (from-to)1257-1260
Number of pages4
JournalGeophysical Research Letters
Issue number8
StatePublished - 15 Apr 1998


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