Table
II:Dipole and Non-dipole Energies
in the Earths Magnetic Field. Calculated by Equations (10) and (11) from IGRF geomagnetic data for the
entire twentieth century (Mandea et al., 2000). Energies are
in petajoules (1 PJ = 1015 joules). The rms error is the
root mean square difference, in nanoteslas, between the magnetic field
intensity B at the earths surface according to the IGRF model
and the observed values, as estimated by Lowe (2000). The sigmas (s) are
the corresponding errors in the dipole, nondipole, and total energies.