Assimilating Data into an $\alpha \Omega$ Dynamo Model of The Sun: A Variational Approach

L. Jouve (1) , A.S. Brun (2) , O. Talagrand (3)

1 IRAP - Institut de recherche en astrophysique et planétologie
2 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
3 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)

We have developed a variational data assimilation technique for the Sun using a toy $\alpha \Omega$ dynamo model. The purpose of this work is to apply modern data assimilation techniques to solar data using a physically based model. This work represents the first step toward a complete variational model of solar magnetism. We derive the adjoint $\alpha \Omega$ dynamo code and use a minimization procedure to invert the spatial dependence of key physical ingredients of the model. We find that the variational technique is very powerful and leads to encouraging results that will be applied to a more realistic model of the solar dynamo.

Mots clés: methods: numerical; Sun: activity; Sun: dynamo

Domaines: Astrophysique [astro-ph]

L. Jouve, A.S. Brun, O. Talagrand. Assimilating Data into an $\alpha \Omega$ Dynamo Model of The Sun: A Variational Approach. The Astrophysical Journal, 2011, 735, pp.31. ⟨10.1088/0004-637X/735/1/31⟩. ⟨cea-00828303⟩