ON THE EFFECT OF ROTATION SPEED TO THE MAIN MAGNETIC FIELD OF THE EARTH

Abstract

We consider the joint variations of the magnetic field and the Earth’s rotation speed. It is shown that in the considered cases, the induction of the geomagnetic field increases with increasing speed of rotation of the Earth and vice versa decreases with its fall. We used the results of instrumental observations performed at magnetic observatories ‒ the Mikhnevo Geophysical Observatory of Sadovsky Institute of Geosphere Dynamics of Russian Academy of Sciences and a number of observatories of the international INTERMAGNET network ‒ located at a distance from the main magnetic anomalies of the Earth, and IERS data on the unevenness of the Earth’s rotation. A quantitative relationship has been obtained between the absolute magnitude of the geomagnetic field induction vector and the LOD value equal to the difference between the observed and ephemeris day duration.