| Source | Current density, µA/m2 | Magnetic field, nT | Electric field, mV/m |
| Field of magnetospheric convection (polar caps) | 10 | 100 | 10 |
| Atmospheric tide (low latitudes) | 1 | 10 | 1 |
| GW (daytime hemisphere) | 1 | 10 | 1 |
| Fields of the Earth and weather systems | 10−4 | 10−3 | 10−4 |