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Saturn's very axisymmetric magnetic field: No detectable secular variation or tilt

Cao, Hao; Dougherty, Michele K.; Russell, Christopher T. +2 more

Saturn is the only planet in the solar system whose observed magnetic field is highly axisymmetric. At least a small deviation from perfect symmetry is required for a dynamo-generated magnetic field. Analyzing more than six years of magnetometer data obtained by Cassini close to the planet, we show that Saturn's observed field is much more axisymm…