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This picture is from a model of how the earth's magnetic field is generated.
Click on image for full size
Glaztmeir and Roberts of LANL

The Generation of Neptune's Magnetosphere

Magnetospheres are generated with 1.) magnetic materials and 2.) with movement of the magnetic material.

The Earth-like planets generate magnetospheres within the iron cores at their centers. However, Neptune has almost no iron core.

Neptune's magnetic field is created by movement in its icy shell.

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