Model calculations of magnetic flux tubes. IV - Convective energy transport and the nature of intermediate size flux concentrations

Details Model calculations of magnetic flux tubes. IV - Convective energy transport and the nature of intermediate size flux concentrations Model calculations of magnetic flux tubes. IV - Convective energy transport and the nature of intermediate size flux concentrations

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202..275k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. 275-283.

Astronomy and Astrophysics

Astrophysics

95

Magnetic Flux, Magnetohydrodynamic Stability, Solar Activity, Solar Magnetic Field, Convection, Energy Budgets, Energy Transfer, Flux Density, Photosphere, Radiative Transfer

Scientific paper

Results of 2D-MHD simulations of solar (sub-) photospheric magnetic flux concentrations with sizes between 500 km and 1000 km are presented. A residual level of convective energy transport within the magnetic structure is assumed to be maintained by oscillatory convection or by motions driven by the Rayleigh-Taylor instability since pure radiative transport leads to density inversions. The calculated flux sheet models demonstrate the decreasing efficiency of heating by lateral influx of radiation with increasing size of the structure. Flux concentrations with sizes greater than about 500 km appear darker than the mean pahotosphere if observed at the center of the solar disk but display a significant brightness enhancement near the limb. The results are used to resolve the apparent contradiction between the data obtained with the Fourier Transform Spectrometer in network and plage regions which imply small, hot and bright structures and spectra with high spatial resolution (less than about 1 arcsec) which reveal comparatively large (1-2 arcsecs), dark magnetic structures in active regions. All observations can be reconciled if the larger structures are clusters of small magnetic elements and partly suppress the convective energy transport.

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