Aclinic Line, the magnetic equator, along which the needle always remains horizontal.
But suppose that the earth is to the North of the magnetic equator of the field, what happens then?
A freely suspended magnetic needle will not maintain a horizontal position except at the magnetic equator.
These lines are made by currents arising from one side of the magnetic equator, and passing over to the other.
H represents the sun, and a the place immediately underneath it, which is also coincident with the magnetic equator.
The magnetic equator, as sought by the dipping needle, is not coincident with the geographical one.
This is the magnetic equator, that neither draws the magnet nor repulses it, and here there is perfect peace.
The value of the horizontal component is zero at the north magnetic pole, and increases toward the magnetic equator.
|magnetic equator |
A line connecting all points on the earth's surface at which the magnetic field is parallel to the Earth's surface. A balanced magnetic needle on the magnetic equator stabilizes in a perfectly horizontal position.