Statistics – Computation
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0804s&link_type=abstract
American Astronomical Society, SPD meeting #42, #8.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Statistics
Computation
Scientific paper
We have performed magneto-convection simulations starting from snapshots of hydrodynamic convection with initial conditions both of uniform vertical magnetic field and with minimally structured (uniform, untwisted), horizontal magnetic field advected into the computational domain from a depth of 20 Mm. One clear result is that while the magnetic field can collect into large-scale concentrations - pores and sunspots - most of the magnetic flux is in small concentrations with steep horizontal gradients in the field and plasma properties. Furthermore, the field strength distribution is a power law with slope between -1 and -2, so most of the field at the surface is weak. A large aperture telescope, such as ATST, is needed both to collect sufficient photons to measure the ubiquitous weak fields and to resolve the small-scale magnetic features.
We present results on flux emergence, pore formation, and Stokes spectra as they would appear in Hinode and ATST compared with the raw simulation.For those interested in analyzing the simulation data, it is available online at steinr.pa.msu.edu/ bob/data.html. There are slices of the velocity and magnetic field vectors at continuum optical depths of 1, 0.1, and 0.01 and the emergent intensity have been saved at 1 minute intervals. Four hour averages, with 2 hour cadence for the 3D cube for variables: velocity, magnetic field, density, temperature, sound speed, and internal energy have been computed. Stokes spectra have been computed for the Hinode FeI 630 nm lines, processed with the Hinode annular mtf, the slit diffraction and frequency smoothing.
This work has been supported by NASA grants NNX07AO71G, NNX07AH79G and NNX08AH44G and NSF grant AST0605738. The simulations where performed on the Pleiades cluster of the NASA Advanced Supercomputing Division at the Ames Research Center.
Georgobiani Dali
Lagerfjärd Anders
Nordlund Aake
Stein Robert F.
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