Research topics

My main research topics concern the solar corona and the Sun-Earth relationships. A large part of my past work concerns the heating of the corona: the solar corona is indeed heated to millions of degrees, and understanding the processes implied in this phenomenon represents one of the most important challenges of solar physics; there are also implications on the physics of the stars in general and for the understanding of the sometimes tumultuous relationships between the Sun and the Earth, especially during solar storms. Another part of my work concerns more specifically the solar wind, which is the extension of the corona to the Earth and the other planets. The solar wind and corona, both highly dynamic and structured by the magnetic field, are also a natural laboratory for the study of plasmas and turbulence. I am especially interested in these objects and topics:

Turbulence in a magnetic flux tube: the Shell-Atm numerical code

The Shell-Atm code (Buchlin and Velli 2007, Verdini et al. 2009) is designed to provide fast simulations of MHD turbulence in a volume dominated by a longitudinal magnetic field B0. Because of this strong field, the turbulent, non-linear dynamics occurs essentially in the planes orthogonal to B0. The Shell-Atm model consists thus of a set of planes orthogonal to B0, in which the non-linear dynamics can be modelled, for instance by shell-models. These planes are piled up along B0, and Alfvén waves propagate between them, allowing the transport of energy from the boundaries of the simulation box.

Shell-Atm has already been used to simulate solar coronal loops, the solar wind, and for theoretical studies of turbulence. The model source code and manual are available from here.

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Contact: Éric Buchlin

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