Earth's Magnetic Dipole Moment
Interactive Earth's Magnetic Field
Simulation estimating Earth's dipole moment from its equatorial magnetic field (0.4 G) and radius (6.4 × 10⁶ m).
Example Values
- Equatorial magnetic field: 0.4 G (4 × 10⁻⁵ T)
- Earth radius: 6.4 × 10⁶ m
- Calculated dipole moment: 1.05 × 10²³ A·m²
- Typical value from geomagnetic texts: ~8 × 10²² A·m²
Input Parameters
Equatorial field (BE): 0.4 G
Earth radius (r): 6.4 × 10⁶ m
μ₀/4π: 10⁻⁷ T·m/A
Calculation
Formula: m = (BE × r³) / (μ₀/4π)
Calculation: (4×10⁻⁵ × (6.4×10⁶)³) / 10⁻⁷
Result: 1.05 × 10²³ A·m²
Typical value: ~8 × 10²² A·m²
Field Conversion
1 Gauss (G): 10⁻⁴ Tesla (T)
0.4 G: 4 × 10⁻⁵ T
Field direction: Parallel to dipole axis at equator
