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Wave propagation in the upper convection zone Robert Cameron Laurent Gizon Max Planck Institute for Solar System Research

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Outline The photosphere The wave code Sunspots

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Regimes of solar magneto- convection G-band image: KIS/VTT, Obs. del Teide, Tenerife sunspot plage ‘quiet’ Sun pore Local structuring -quiet Sun -plage -umbral dots Global structuring -pores -sunspots -flux emergence

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Linear, ideal equations Currently no background flows are allowed.

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BCs and IC Upper BC: vertical components of shear stress tensor vanishes Lower: perturbation vanishes Sides: periodic IC: arbitrary, but eg right moving f-mode wave packet.

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Numerical scheme Spectral (fourier) in the horizontal directions. Uses FFTW. Finite difference (2-step Lax-Wendroff) in the Vertical (This will probably change soon.) Status: preliminary results, some test cases.

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We will (at some point) provide Wave code Sample background You will need to make your own interesting atmospheres. (Possibly eg using fully non-linear backgrounds from Stein and Nordlund).

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Sunspot models From Rempel and Schüssler

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Preliminary Simulation

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Observations from Gizon

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Working on Background velocities. Top BC Extending the atmosphere upwards What to do with high Alfven velocities

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Quiet Sun simulations MURaM Quiet sun granulation box extended upwards with Model S atmosphere.

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HELAS Wants to collect and make available modeling tools. What type of tools are interesting? (Please discuss this afternoon and not during my question time.) Working (essential) and documented (please?). Maintenance is probably unreasonable, but perhaps we should have a users (where should the apostrophe go?) blog for each tool?

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