Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh23d..01m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH23D-01
Astronomy and Astrophysics
Astrophysics
[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle, [7537] Solar Physics, Astrophysics, And Astronomy / Solar And Stellar Variability, [7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory
Scientific paper
Solar observations throughout the extended minimum between cyles 23 and 24 have highlighted the intrinsically three-dimensional (3D) nature of the solar magnetic field. These include prominent multipolar components and low-latitude coronal holes observed with STEREO, asymmetric surface flux distributions in photospheric magnetograms, ond global, multi-scale magnetic linkages revealed by SDO. Axisymmetric mean-field dynamo models cannot capture this complexity, which ultimately arises from turbulent convection. The solar dynamo is a convective dynamo; convection is clearly responsible for the diversity of solar magnetic activity we observe, generating and organizing magnetic fields both directly by turbulent induction and indirectly via mean flows and MHD instabilities. Simulations of convective dynamos reveal the 3D nature of how large-scale magnetic fields are generated and provide insight into the intricate topology of the solar magnetic field, apparent even during solar minimum. I will describe recent work on the role of helicity and shear in magnetic self-organization and promising first steps toward linking convective dynamos with flux emergence.
Brown Bailey
Browning Matthew
Brun Allan Sacha
Miesch Marck
Nelson Nicholas
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