These changes are referred to as " secular variation ".
2.
See figure " secular variation of constant ".
3.
The Earth's magnetic fields are constantly changing which is referred to as geomagnetic secular variation.
4.
Such changes are referred to as " paleomagnetic secular variation " or " paleosecular variation ( PSV ) ".
5.
Changes in Earth's magnetic field on a time scale of a year or more are referred to as " secular variation ".
6.
In a perturbation-series approach, this easily gives rise to a spurious secular variation of the solution, in contradiction with the periodic behaviour of the waves.
7.
The "'International Geomagnetic Reference Field ( IGRF ) "'is a standard mathematical description of the large-scale structure of the secular variation.
8.
In the core, they probably have little observable effect on the geomagnetic field, but slower waves such as magnetic Rossby waves may be one source of geomagnetic secular variation.
9.
The " secular variations of the planetary orbits " is a concept describing long-term changes ( secular variation ) in the orbits of the planets Keplerian ellipses.
10.
The " secular variations of the planetary orbits " is a concept describing long-term changes ( secular variation ) in the orbits of the planets Keplerian ellipses.
