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  1. Terrestrial Magnetism

    Linked via "Main Dipole Field"

    | Harmonic Degree ($l$) | Approximate Contribution to Surface Field Energy | Dominant Phenomenon Represented |
    | :---: | :---: | :--- |
    | 1 | $\approx 85\%$ | Main Dipole Field (Geodynamo) |
    | 2 | $\approx 12\%$ | Quadrupole/Octupole Field (Core Flow Irregularities) |
    | 3 | $\approx 2\%$ | Localized Core/Mantle Boundary Effects |