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The magnetosphere is the region around a planet where the solar wind is significantly altered due to the magnetic field of the planet.

Planets with a magnetic field arising from internal processes are said to have a global magnetic field. A Global magnetic field will produce a magnetosphere.

Six of the planets have global magnetic fields, and hence some magnetosphere;

Mercury, Earth, Jupiter, Saturn, Uranus, Neptune.

Mars did have one, but when the core froze, that ended the geodynamo.

Venus, the near twin of Earth, does not have a geomagnetic field and that is quite perplexing. It too lacks a geodynamo and no one knows why.

There are remnant magnetic fields for Mars and Venus, but they are too small to have any significant effect on the solar wind.

Jupiter and Saturn have huge magnetic fields and there are only general theories as to what causes them.

Uranus has a middling magnetic field, more in the range of Earth's field.

The moon has no significant field.

We have no idea whether Pluto does or not, but it would be unlikely.

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12y ago

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