Evidence for transonic flows in the solar granulation

Details Evidence for transonic flows in the solar granulation Evidence for transonic flows in the solar granulation

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..99n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L99-L102.

Astronomy and Astrophysics

Astronomy

34

Solar Convection (Astronomy), Solar Granulation, Transonic Flow, Flow Distribution, Mathematical Models, Shock Fronts, Spatial Resolution, Spectrograms, Turbulence Effects

Scientific paper

High-resolution observations of the solar granulation are interpreted in the light of recent numerical simulations of compressible convection. The observations show a negative correlation between the width of suitably chosen, nonmagnetic lines and the continuum intensity. This result is consistent with a model of granular convection where regions of supersonic horizontal flow form intermittently in the vicinity of the downflow lanes. We conjecture that the observed line broadening in the regions of low intensity is caused by enhanced turbulent fluctuations generated by the passage of shock fronts bounding the regions of supersonic motion.

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