Solar dynamo

dynamoSolar Dynamo theorydynamo processmagnetic field of the sunmagnetic fields near the Sunstellar dynamos
The solar dynamo is a physical process that generates the Sun's magnetic field.wikipedia
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Sun

solarSolThe Sun
The solar dynamo is a physical process that generates the Sun's magnetic field.
It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process.

Dynamo theory

dynamogeodynamogeodynamo effect
It is explained with a variant of the dynamo theory.
The conductive fluid in the geodynamo is liquid iron in the outer core, and in the solar dynamo is ionized gas at the tachocline.

Magnetic field

magnetic fieldsmagneticmagnetic flux density
The solar dynamo is a physical process that generates the Sun's magnetic field.

Solar cycle

solar variationsolar activitysunspot cycle
The most prominent time variation of the solar magnetic field is related to the quasi-periodic 11-year solar cycle, characterized by an increasing and decreasing number and size of sunspots.
Complex coronal magnetic field structures evolve in response to fluid motions at the solar surface, and emergence of magnetic flux produced by dynamo action in the solar interior.

Tachocline

Currently, the geometry and width of the tachocline are hypothesized to play an important role in models of the solar dynamo by winding up the weaker poloidal field to create a much stronger toroidal field.
The geometry and width of the tachocline are thought to play an important role in models of the stellar dynamos by winding up the weaker poloidal field to create a much stronger toroidal field.

Solar phenomena

solar activitysolarsunspot activity
These phenomena are apparently generated by a helical dynamo near the center of the Sun's mass that generates strong magnetic fields and a chaotic dynamo near the surface that generates smaller magnetic field fluctuations.

Solar minimum

solar minimagrand minimumsolar-cycle minimum
At a typical solar minimum, few or no sunspots are visible.
Scientists from the National Center for Atmospheric Research (NCAR) also developed a computer model of solar dynamics (Solar dynamo) for more accurate predictions and have confidence in the forecast based upon a series of test runs with the newly developed model simulating the strength of the past eight solar cycles with more than 98% accuracy.

Stellar magnetic field

magnetic fieldmagnetic activityactive
Stellar magnetic fields, according to solar dynamo theory, are caused within the convective zone of the star.

Babcock Model

Babcockdynamo model of the solar cyclemagnetic coiling sunspot theory
The 11-year sunspot cycle is half of a 22-year Babcock–Leighton solar dynamo cycle, which corresponds to an oscillatory exchange of energy between toroidal and poloidal solar magnetic fields.
This oscillation is known as the Babcock-Leighton dynamo cycle, amounting to the oscillatory exchange of energy between poloidal and toroidal solar magnetic field ingredients.

Physics

physicistphysicalphysicists
The solar dynamo is a physical process that generates the Sun's magnetic field.

Electric current

currentelectrical currentcurrents
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.

Ampère's circuital law

Ampère's lawAmpere's lawAmpere's circuital law
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.

Faraday's law of induction

Faraday's lawMaxwell–Faraday equationelectromagnetic induction
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.

Ohm's law

ohmicOhmohmic losses
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.

Fluid dynamics

hydrodynamicshydrodynamicfluid flow
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.

Magnetohydrodynamics

magnetohydrodynamicMHDmagneto-hydrodynamics
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.

Dynamo

dynamo-electric machinedynamosbrush arc light dynamos
A dynamo converts kinetic energy into electric-magnetic energy.

Kinetic energy

kinetickinetic energiesenergy
A dynamo converts kinetic energy into electric-magnetic energy.

Electrical conductor

conductorconductiveconductors
An electrically conducting fluid with shear or more complicated motion, such as turbulence, can temporarily amplify a magnetic field through Lenz's law: fluid motion relative to a magnetic field induces electric currents in the fluid that distort the initial field.

Vorticity

vortex dynamicsvortex lineVORTEX LINES
An electrically conducting fluid with shear or more complicated motion, such as turbulence, can temporarily amplify a magnetic field through Lenz's law: fluid motion relative to a magnetic field induces electric currents in the fluid that distort the initial field.

Lenz's law

his important lawlawLenz effect
An electrically conducting fluid with shear or more complicated motion, such as turbulence, can temporarily amplify a magnetic field through Lenz's law: fluid motion relative to a magnetic field induces electric currents in the fluid that distort the initial field.

Magnetohydrodynamic generator

MHD generatorMHD dynamoMHD generators
Such systems are called self-sustaining dynamos.

Differential rotation

differentially rotatingdifferentiallyDifferential rotation in stars
The Sun is a self-sustaining dynamo that converts convective motion and differential rotation within the Sun to electric-magnetic energy.

Toroidal and poloidal

poloidaltoroidalpoloidally
Currently, the geometry and width of the tachocline are hypothesized to play an important role in models of the solar dynamo by winding up the weaker poloidal field to create a much stronger toroidal field. The 11-year sunspot cycle is half of a 22-year Babcock–Leighton solar dynamo cycle, which corresponds to an oscillatory exchange of energy between toroidal and poloidal solar magnetic fields.