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Four Categories of Fields <br />
• Large Fields , predominantly dipolar <br />
Earth, Ganymede, Jupiter, Saturn, maybe Mercury <br />
• Large Fields, predominantly non-‐dipolar <br />
Uranus, Neptune <br />
• Small Fields arising from Crustal magneHsm; possible <br />
past dynamos <br />
Moon, Mars, Venus? <br />
• Small fields arising from inducHon (Hme-‐varying <br />
external field) <br />
Io?, Europa, Callisto
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