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Resource: used or used up in processesMagnetic field
Appears in 2 processs and 6 steps. Everything below is linked: open a process to see it in context.
Top processes
- Convection of molten iron in the outer core, driven by cooling and by light elements released as the inner core freezes, generates over 90% of the surface field
- Rotation organises the flow so the field outside the core is mostly a dipole, with surface intensity of about 22,000 to 65,000 nT
- The dipole has weakened about 9% in 150 years and about 30% in 2,000 years, mainly from reversed-flux patches growing under the South Atlantic
- and 2 more in this process
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