Bibcode
Khomenko, E.; Vitas, N.; Collados, M.; de Vicente, A.
Bibliographical reference
Astronomy and Astrophysics, Volume 604, id.A66, 8 pp.
Advertised on:
8
2017
Journal
Citations
38
Refereed citations
37
Description
The magnetic fields of the quiet Sun cover at any time more than 90% of
its surface and their magnetic energy budget is crucial to explain the
thermal structure of the solar atmosphere. One of the possible origins
of these fields is the action of the local dynamo in the upper
convection zone of the Sun. Existing simulations of the local solar
dynamo require an initial seed field and sufficiently high spatial
resolution in order to achieve the amplification of the seed field to
the observed values in the quiet Sun. Here we report an alternative
model of seeding based on the action of the Bierman battery effect. This
effect generates a magnetic field due to the local imbalances in
electron pressure in the partially ionized solar plasma. We show that
the battery effect self-consistently creates from zero an initial seed
field of a strength of the order of micro G, and together with dynamo
amplification allows the generation of quiet Sun magnetic fields of a
similar strength to those from solar observations.
Related projects
Numerical Simulation of Astrophysical Processes
Numerical simulation through complex computer codes has been a fundamental tool in physics and technology research for decades. The rapid growth of computing capabilities, coupled with significant advances in numerical mathematics, has made this branch of research accessible to medium-sized research centers, bridging the gap between theoretical and
Daniel Elías
Nóbrega Siverio
Solar and Stellar Magnetism
Magnetic fields are at the base of star formation and stellar structure and evolution. When stars are born, magnetic fields brake the rotation during the collapse of the mollecular cloud. In the end of the life of a star, magnetic fields can play a key role in the form of the strong winds that lead to the last stages of stellar evolution. During
Tobías
Felipe García
Magnetism, Polarization and Radiative Transfer in Astrophysics
Magnetic fields pervade all astrophysical plasmas and govern most of the variability in the Universe at intermediate time scales. They are present in stars across the whole Hertzsprung-Russell diagram, in galaxies, and even perhaps in the intergalactic medium. Polarized light provides the most reliable source of information at our disposal for the
Tanausú del
Pino Alemán