Sun  ID: 3583

The Solar Dynamo: Toroidal and Radial Magnetic Fields

Using the solar plasma flows as input (see The Solar Dynamo: Plasma Flows), the equations of magnetohydrodynamics, and 'seeding' the calculations with an initial small magnetic field, one can compute how a magnetic field can grow and be maintained. This is the dynamo process, the net result being that part of the Sun's outflowing thermal convective energy from nuclear processes is used to create the magnetic field.

In this view of the solar dynamo mechanism, we examine the evolution of the toroidal magnetic field, intensities represented by color on the right-hand cross-section, and the radial magnetic field, represented on the left-hand cross-section. To see the poloidal magnetic vector potential, see The Solar Dynamo: Toroidal and Poloidal Magnetic Fields.

In this visualization, the magnetic field lines (represented by the 'copper wire' structures) are 'snapshots' of the field structure constructed at each time step of the model. These field lines should not be considered as 'moving' or 'stretching' as the model evolves in time.

Even this simplified model reproduces a number of characteristics observed in the actual solar magnetic field.

  1. Cyclic behavior with oscillations in the magnetic field amplitude.
  2. Magnetic regions at the surface migrate from high latitudes towards the equator. This reproduces the "Butterfly Diagram" pattern.
  3. Surface magnetic polarities reverse with each cycle

Because this model is axisymmetric, it cannot simulate non-axisymmetric features such as active longitudes.



Visualization Credits

Tom Bridgman (Global Science and Technology, Inc.): Lead Animator
Andres Munoz-Jaramillo (Montana State University): Scientist
Dibyendu Nandi (Indian Institute of Science Education and Research, Kolkata): Scientist
William D. Pesnell (NASA/GSFC): Scientist
Petrus C. H. Martens (Harvard Smithsonian Center for Astrophysics): Scientist
Please give credit for this item to:
NASA/Goddard Space Flight Center Scientific Visualization Studio

Science Paper:
Helioseismic Data Inclusion in Solar Dynamo Models

Short URL to share this page:


Data Used:
SOHO/Michelson Doppler Interferometer (MDI)/Continuum
NASA and ESA - May 1996-February 2009
Note: While we identify the data sets used in these visualizations, we do not store any further details nor the data sets themselves on our site.

This item is part of these series:
SDO Pre-launch
Solar Dynamo
SDO - Visualizations

SVS >> Magnetic Fields
SVS >> Solar Cycle
SVS >> Solar Rotation
GCMD >> Location >> Solar Interior
SVS >> Hyperwall
SVS >> For Educators
SVS >> Solar Plasma Flows
SVS >> Solar Magnetic Field
NASA Science >> Sun

GCMD keywords can be found on the Internet with the following citation: Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version