Geomagnetic Latitude


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geomagnetic latitude

[¦jē·ō·mag¦ned·ik ′lad·ə‚tüd]
(geophysics)
The magnetic latitude that a location would have if the field of the earth were to be replaced by a dipole field closely approximating it.

Latitude, Geomagnetic

 

the angle ϕ, which is the complement (to 90°) of the angle formed by the axis of a uniformly magnetized earth (the axis of the earth’s magnetic dipole) and a radius vector drawn from the center of the earth to a given point on its surface. Geomagnetic latitude ranges from +90° at the geomagnetic pole in the northern hemisphere to –90° at the pole in the southern hemisphere.

The concept of geomagnetic latitude is used in studying various geophysical phenomena. However, for detailed investigations of the latitudinal distribution of the aurora borealis, magnetic and ionospheric disturbances, the absorption of cosmic radiation, and similar phenomena, the concept of corrected geomagnetic latitude is used. Its calculation considers both the dipole members and the higher terms in the expansion of the earth’s potential in a series of spherical harmonics. (SeeTERRESTRIAL MAGNETISM.)

REFERENCE

Akasafu, S. I., and S. Chapman. Solnechno-zemnaia fizika, part 1. Moscow, 1974. (Translated from English.)
References in periodicals archive ?
For scaling according to Dunai (2001), the inclination is calculated from geomagnetic latitude by the GAD formula tan(I) = 2 tan ([L.
The retained variables in the regression model are the magnetic inclination, the geomagnetic latitude and the total field.
The manual helps with explanations of the various data sets, but to make the software friendlier to nonexperts, it features "activity models" that predict visible auroras for three geomagnetic latitude zones: high, middle, and low.