On the origin of secular variations of the Earth's main magnetic field.
Abstract
A mechanism is proposed for the excitation of magnetic disturbances that induce secular geomagnetic variations with characteristic times of less than 100 years (e.g., 60-year variations). These disturbances have the form of concentrated flux ropes and loops generated by the fluctuation-type MHD dynamo in the earth's liquid core. The observed variations are caused by ropes situated in the 60-km-thick skin layer near the core-mantle boundary.
- Publication:
-
Geomagnetism and Aeronomy
- Pub Date:
- December 1989
- Bibcode:
- 1989Ge&Ae..29.1001R
- Keywords:
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- Geomagnetism;
- Magnetic Variations;
- Secular Variations;
- Earth Core;
- Earth Mantle;
- Magnetohydrodynamics;
- Geomagnetic Field: Secular Variations