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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Color in Coordination Complexes
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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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Magnetism, dynamo action and the solar-stellar connection.

Allan Sacha Brun1, Matthew K Browning2

  • 1Laboratoire AIM, DRF/IRFU/Département d'Astrophysique, CEA-Saclay, 91191 Gif-sur-Yvette France.

Living Reviews in Solar Physics
|January 31, 2020
PubMed
Summary

Stellar magnetism, crucial for star evolution, is studied through solar and stellar observations, theory, and simulations. This research explores magnetic field generation and maintenance across different stars, enhancing our understanding of the Sun-stellar connection.

Keywords:
ConvectionDynamoMagnetohydrodynamics (MHD)Methods: numericalStars: magnetism, rotation, windStellar magnetismSun: magnetic fields, rotation

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Area of Science:

  • Astronomy and Astrophysics
  • Stellar Physics
  • Plasma Physics

Background:

  • Magnetism is a fundamental property of stars, including our Sun, influencing their interiors and evolution.
  • Observing the Sun provides detailed but time-limited snapshots of stellar magnetism.
  • Studying other stars, alongside theory and simulations, is essential to understand magnetism's dependence on stellar properties like age, mass, and rotation.

Purpose of the Study:

  • To review current observations and theories of magnetism in the Sun and other stars.
  • To explore the 'Solar-stellar connection,' examining how studying one informs the other.
  • To highlight key findings that constrain theories of magnetic field generation and maintenance.

Main Methods:

  • Review of observational techniques for measuring or inferring stellar magnetic fields.
  • Synthesis of theoretical concepts, including convection and dynamo theory (e.g., mean-field theory).
  • Analysis of simulations of convection and magnetism in stellar interiors.

Main Results:

  • Key observational findings constrain theories of stellar magnetic field generation.
  • Simulations reveal peculiarities in field generation across different star types.
  • Identified unifying physical processes likely governing dynamo action in stars.

Conclusions:

  • Significant progress has been made in understanding stellar magnetism through combined solar and stellar studies.
  • The study highlights both learned aspects and remaining uncertainties in stellar dynamo theory.
  • Further research is needed to solve outstanding issues in stellar magnetism.