Geoscience Reference
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(a)
n
-
−
−
−
−
−
−
−
−
−
−
−
−
−
−
(b)
n
-
−
−
−
−
−
−
−
−
−
−
−
−
−
−
Figure 3.1.
(a) The total intensity of the Earth's magnetic field in microteslas (
µ
T).
(b) The total intensity of the non-dipole component of the Earth's magnetic field
(magnetic field - best-fitting dipole field) in microteslas (
µ
T). The field is the
International Geomagnetic Reference Field (IGRF seventh generation). The
nanotesla (1 nT = 10
−3
µ
T),anSIunit, is the same as gamma (
γ
), the magnetic field
unit of the old c.g.s. system.
