The IGRF-13 Gauss coefficients for epoch 1980.0 are , ,

PHYSICS · Multi-part · Fermi University Physics · Earth, Climate & Energy Physics · The solid Earth: structure, fields and thermal history · The solid Earth: structure, fields and thermal history

The Solid Earth, Ch The geomagnetic field: potential, spectrum, induction and the palaeomagnetic record

Problem

The IGRF-13 Gauss coefficients for epoch 1980.0 are g10=−29 992 nTg_1^0 = -29\,992\,\mathrm{nT}, g11=−1956 nTg_1^1 = -1956\,\mathrm{nT}, h11=5604 nTh_1^1 = 5604\,\mathrm{nT}. Take the Earth's radius as a=6371.2 kma = 6371.2\,\mathrm{km} and μ0=4π×10−7 T m A−1\mu_0 = 4\pi\times10^{-7}\,\mathrm{T\,m\,A^{-1}}. ((a)) Compute the equatorial dipole surface field B0=(g10)2+(g11)2+(h11)2B_0 = \sqrt{(g_1^0)^2+(g_1^1)^2+(h_1^1)^2}. ((b)) Compute the dipole moment m=4πa3B0/μ0m = 4\pi a^3 B_0/\mu_0. ((c)) Compute the tilt of the dipole axis from the rotation axis, θ0=arccos⁡(∣g10∣/B0)\theta_0=\arccos(|g_1^0|/B_0).

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