1 / 18

EULAG-MHD: simulation of global solar dynamo

Piotr K Smolarkiewicz*,. EULAG-MHD: simulation of global solar dynamo. *National Center for Atmospheric Research, Boulder, Colorado, U.S.A.

edolie
Download Presentation

EULAG-MHD: simulation of global solar dynamo

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Piotr K Smolarkiewicz*, EULAG-MHD: simulation of global solar dynamo *National Center for Atmospheric Research, Boulder, Colorado, U.S.A.

  2. Mihai Ghizaru, Paul Charbonneau, PK Smolarkiewicz, MAGNETIC CYCLES IN GLOBAL LARGE-EDDY SIMULATIONS OF SOLAR CONVECTION, The Astrophysical Journal Letters, 715:L133–L137, 2010; R. Bhattacharyya, B.C. Low, and P.K. SmolarkiewiczOn spontaneous formation of current sheets: Untwisted magnetic fields. PHYSICS OF PLASMAS 17, 112901 2010Etienne Racine, P Charbonneau, M Ghizaru, Amelie Bouchat, PK Smolarkiewicz, ON THE MODE OF DYNAMO ACTION IN A GLOBAL LARGE-EDDY SIMULATION OF SOLAR CONVECTION, The Astrophysical Journal, 735:46 (22pp), 2011;

  3. Toroidal component of B in the uppermost portion of the stable layer underlying the convective envelope at r/R≈0 .7 

  4. Standard anelastic equations of solar magnetohydrodynamics Brun, Miesch & Toomre,

  5. Elemental EULAG formulation The underlying ambient states assumes mean Sun

  6. Coordinate dependent form

  7. Numerical approximations; preliminaries elliptic problems for potentials 

  8. Specialized MHD implementation Hydrodynamic block

  9. Magnetic block Thermodynamics

  10. Model setups stable up to and unstable stable aloft

  11. Power of ILES

  12. Magnetic cycles

  13. Mode of large-scale dynamo action

  14. Remarks Notwithstanding some departures from the real solar climate, global MHD simulations of solar-like cycles have landed. EULAG-MHD offers an outstanding virtual MHD laboratory allowing to address quantitatively a number of questions that could until now only be speculated upon on the basis of simplified model formulations. There is much to be learned. For example, our calculations suggest that the entire magnetic variability involves less then 10% of solar luminosity  connection to physics of other “dissipative structures” (QBO, MJO, ….)

  15. Deriving the entropy equation

  16. What is A operator? Multidimensional positive definite advection transport algorithm (MPDATA):

More Related