Super-granulation Scale Convection

SimulationsRobert Stein, David Benson - Mich. State Univ.

Aake Nordlund - Niels Bohr Institute

Initialization• Start from existing 12 x 12 x 9 Mm simulation• Extend adiabatically in depth to 20 Mm,

no fluctuations in extended portion, relax for a solar day to develop structure in extended region

• Double horizontally + small fraction of stretched fluctuations to remove symmetry,relax to develop large scale structures

• Currently: 48x48x20 Mm100 km horizontal, 12-75 km vertical resolution

InitializationDouble horizontally + small fraction stretched : Uz at 17.3 Mm

QuickTime™ and aPhoto - JPEG decompressor

are needed to see this picture.

QuickTime™ and aPhoto - JPEG decompressor

are needed to see this picture.

Mean AtmosphereTemperature, Density and Pressure

(105 dynes/cm2)

(10-7 gm/cm2)

(K)

Mean AtmosphereIonization of He, He I and He II

Convective Flux, 48 Mm wide, after 2 hours

Velocity spectrum, (kP(k))1/2

*

* ***

*

MDI doppler (Hathaway) TRACE

correlation tracking (Shine)

MDI correlation tracking (Shine)

3-D simulations (Stein & Nordlund)

The End