Advances and Challenges in Observations and Modeling of the Global-Sun Dynamics and Dynamo

Alexander Kosovichev, Gustavo Guerrero, Andrey Stejko, Valery Pipin, Alexander Getling

Research output: Contribution to journalArticlepeer-review


Computational heliophysics has shed light on the fundamental physical processes inside the Sun, such as the differential rotation, meridional circulation, and dynamo-generation of magnetic fields. However, despite the substantial advances, the current results of 3D MHD simulations are still far from reproducing helioseismic inferences and surface observations. The reason is the multi-scale nature of the solar dynamics, covering a vast range of scales, which cannot be solved with the current computational resources. In such a situation, significant progress has been achieved by the mean-field approach, based on the separation of small-scale turbulence and large-scale dynamics. The mean-field simulations can reproduce solar observations, qualitatively and quantitatively, and uncover new phenomena. However, they do not reveal the complex physics of large-scale convection, solar magnetic cycles, and the magnetic self-organization that causes sunspots and solar eruptions. Thus, developing a synergy of these approaches seems to be a necessary but very challenging task.

Original languageEnglish (US)
Pages (from-to)333-352
Number of pages20
JournalProceedings of the International Astronomical Union
StatePublished - Jun 8 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • MHD
  • Sun: activity
  • Sun: helioseismology
  • Sun: interior
  • Sun: magnetic fields
  • turbulence


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