Evolution of the inner core of the earth: consequences for geodynamoстатья
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Дата последнего поиска статьи во внешних источниках: 3 июля 2019 г.
Аннотация:Using models of the Earth’s core evolution and the length of the day observations, the change
of the dimensionless geodynamo parameters is considered. The evolutionary model includes
cooling of the liquid adiabatic core, growing solid core, and the region in the outer part of the core with a subadiabatic temperature gradient. The model covers the time period 4.5 Ga in the past till 1.5 Gy to the future and produces an evolution of the energy sources of thermal and compositional convection, spatial scales of the convective zone. These quantities are used for Ekman, Rayleigh and Rossby numbers’ estimates. So far as these numbers determine the regime of the geomagnetic field generation, we discuss the evolution of the geomagnetic field over the Earth’s evolution.