Numerical simulation of the interaction between solar granules and small-scale magnetic fields

Details Numerical simulation of the interaction between solar granules and small-scale magnetic fields Numerical simulation of the interaction between solar granules and small-scale magnetic fields

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996kfnt...12d..32a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol.12, no.4, p. 32-45.

Computer Science

7

Sun: Mhd, Sun: Magnetic Fields, Sun: Granulation

Scientific paper

We investigate the interaction between solar granules and small-scale magnetic fields n photospheric regions with different magnetic fluxes using numerical simulation based on the full system of radiation magnetohydrodynamics equations. Four sequences of 2D time-dependent models were computed for photospheric regions with average vertical magnetic fluxes of 0, 10, 20, and 30 mT. We have not found substantial variations in the temperature structure with average field strength while the density and gas pressure profiles in 2D models vary considerably. The solar granulation brightness field varies substantially with the magnetic flux. The contribution of the small-scale component to the intensity power spectrum increases with average field strength whereas that of the large-scale component (of about a granule size) decreases at approximately the same values of total r.m.s. intensity fluctuations. Thus, the observed decrease in r.m.s. intensity fluctuations with increase in the average magnetic flux may be interpreted as smoothing of the small-scale component of the power spectrum by the modulation transfer function of the telescope.

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