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The solar dynamo is a physical process that generates the Sun's magnetic field.It is explained with a variant of the dynamo theory.A naturally occurring electric generator in the Sun's interior produces electric currents and a magnetic field, following the laws of Ampère, Faraday and Ohm, as well as the laws of fluid dynamics, which together form the laws of magnetohydrodynamics.
On the largest scale, the Sun supports an oscillatory magnetic field, with a quasi-steady periodicity of 22 years. [2] [3] This oscillation is known as the Babcock-Leighton dynamo cycle, proposed by Robert B. Leighton, amounting to the oscillatory exchange of energy between poloidal and toroidal solar magnetic field ingredients.
The Atmospheric dynamo is a pattern of electrical currents that are set up in the Earth's ionosphere by multiple effects, mostly the Sun's solar wind, but also the tides of the Moon and Sun. [1] [2] The currents flow in circuits between the poles and the equator, but they are not well understood.
This means that dynamo theory was originally used to explain the Sun's magnetic field in its relationship with that of the Earth. However, this hypothesis, which was initially proposed by Joseph Larmor in 1919, has been modified due to extensive studies of magnetic secular variation , paleomagnetism (including polarity reversals ), seismology ...
Modern dynamo models are able to reproduce the solar cycle without any planetary influence. [23] In 1974 the book The Jupiter Effect suggested that the alignment of the planets would alter the Sun's solar wind and, in turn, Earth's weather, culminating in multiple catastrophes on March 10, 1982. None of the catastrophes occurred.
The magnetic field of the Sun is driving this filament eruption. NOAA image. Holly Gilbert, NASA GSFC solar scientist, explains a model of magnetic fields on the sun. A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star.
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In the Solar System this includes the Sun, Mercury, Earth, Jupiter, Saturn, Uranus, Neptune, [16] and Ganymede. The magnetosphere of Jupiter is the largest planetary magnetosphere in the Solar System, extending up to 7,000,000 kilometers (4,300,000 mi) on the dayside and almost to the orbit of Saturn on the nightside. [ 17 ]