The quantity obtained by multiplying the distance between two magnetic poles by the average strength of the poles.



Related Terms

VERTICAL INTENSITY OF THE EARTH’S MAGNETIC FIELD

The strength of the vertical component of the earth’s magnetic field.

MAGNETIC INTENSITY

The strength of a magnetic field. Also called MAGNETIC FORCE.

ELECTROMAGNETIC INDUCTION

The production of electromotive force (EMF) in a conductor through relative motion of a conductor and a magnetic field, or by the change in the strength of magnetic flux around the conductor.

MAGNETIC DIP

Angular distance between the horizontal and the direction of a line of force of the earth’s magnetic field at any point. Also called DIP, MAGNETIC INCLINATION.

SHIELDING FACTOR

The ratio of the strength of the magnetic field at a compass to the strength if there were no disturbing material nearby; usually expressed as a decimal. Because of the metal of a vessel, the strength of the earth’s magnetic field is reduced somewhat at a compass location aboard ship. The shielding factor is one minus the percentage of reduction.

ATTENUATION

  1. A lessening in amount, particularly the reduction of the amplitude of a wave with distance from the origin. 2. The decrease in the strength of a radar wave resulting from absorption, scattering, and reflection by the medium through which it passes (wave guide, atmosphere) and by obstructions in its path. Also attenuation of the wave may be the result of artificial means, such as the inclusion of an attenuator in the circuitry or by placing an absorbing device in the path of the wave.

ELASTIC HYSTERESIS

Phenomenon exhibited by some solids in which the deformation of the solid depends not only on the stress applied to the solid but also on the previous history of this stress; analogous to magnetic hysteresis, with magnetic field strength and magnetic induction replaced by stress and strain respectively.

DEGAUSSING

Neutralization of the strength of the magnetic field of a vessel, using electric coils permanently installed in the vessel.

COTTON BALANCE

A device which employs a current-carrying conductor of special shape to determine the strength of a magnetic field.

MAGNETIC DIRECTION

Horizontal direction expressed as angular distance from magnetic north. magnetic diurnal variation. Oscillations of the earth’s magnetic field which have a periodicity of about a day and which depend to a close approximation only on local time and geographic latitude. Also called MAGNETIC DAILY VARIATION.

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