Facts about Ganymede's Magnetosphere
- 09
Ganymede's magnetosphere experiences daily oscillations in strength as the moon orbits Jupiter every 7.15 days, causing periodic compressions and expansions of the induced magnetic field.
- 08
Ganymede's magnetosphere exhibits a bow shock upstream of the moon where Jupiter's magnetospheric plasma decelerates from supersonic to subsonic speeds, a phenomenon first clearly identified by Galileo spacecraft magnetometer data in 1997.
- 07
Io's volcanic particles feed Jupiter's magnetosphere, which subsequently energizes Ganymede's magnetosphere through high-energy electron precipitation at rates exceeding 100 megawatts during peak activity.
- 06
Magnetospheric observations from the Galileo orbiter between 1995 and 2003 measured Ganymede's induced magnetic moment at 1.3 megagauss-kilometers cubed, smaller than Earth's but sustained by subsurface ocean conductivity.
- 05
Ganymede's magnetosphere exhibits a reconnection region on its dayside where Jupiter's magnetic field lines merge with the moon's induced field, releasing energy that accelerates electrons to relativistic speeds.
- 04
Magnetospheric asymmetry on Ganymede causes the nightside magnetosphere to extend approximately 3 times farther than the dayside due to Jupiter's plasma sheet compression.
- 03
Plasma waves detected by NASA's Galileo spacecraft in 1996 revealed that Ganymede's magnetosphere contains a subsurface ocean conducting electrical currents that strengthen the moon's magnetic field.
- 02
Ganymede's induced magnetosphere creates an auroral oval in the moon's upper atmosphere when charged particles from Jupiter's magnetodisc collide with atmospheric molecules.
- 01
Jupiter's magnetic field generates a magnetosphere around Ganymede with an induced dipole moment of approximately 1.3 megagauss-kilometers cubed.