Other
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..170r&link_type=abstract
Nature (ISSN 0028-0836), vol. 318, Nov. 14, 1985, p. 170, 171. Research supported by the Institut National d'Astronomie et de Ge
Other
75
Atmospheric Circulation, Convection, Meridional Flow, Solar Atmosphere, Sunspots, Photosphere, Solar Activity, Solar Rotation, Spectroheliographs, Temporal Distribution
Scientific paper
The rotational rate and meridional drift for individual sunspots has been measured with an accuracy of a few m/s, and a new phenomenon which may lead to a drastic revision of ideas on the large-scale convection of the sun has been observed. Newly born sunspots trace a roughly axisymmetric meridional circulation in the form of four zonal bands with relatively large amplitude. If these drifts are assumed to trace fluid motions at some level in the solar envelope, the resulting circulation pattern cannot be associated with 'banana' cells expected for the large-scale motions related to the sun's global convection and dynamo. Results based on two sets of data are reported: one involving a detailed analysis of two periods, each covering five solar rotations, and another which is essentially qualitative and results from eye-estimates of the spot meridional drifts over much longer time sequences.
Mangeney Andre
Mein Pierre
Ribes Elizabeth
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