Mesogranulation - A convective phenomenon

Details Mesogranulation - A convective phenomenon Mesogranulation - A convective phenomenon

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216..259d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 259-264.

Astronomy and Astrophysics

Astrophysics

30

Convection, Photosphere, Solar Activity, Solar Granulation, Atmospheric Stratification, Fraunhofer Lines, Magnetohydrodynamic Flow, Mesoscale Phenomena

Scientific paper

The dynamic behavior of mesogranulation at photospheric layers is investigated. A distinct regime of coherent velocity and brightness fluctuations is noted in the 4.5-10-arcsec range of spatial scales. The observed phases are consistent with those that are expected for hydrodynamic flows near the bottom of a stably stratified atmosphere. A smooth transition of phases is noted between the granular and the meso regime. The ratio of horizontal/radial flow velocity is shown to gradually increase with the element size over the whole range, suggesting that the mesogranules are convective in nature.

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