Preliminary observations of velocity fields at the solar poles

Details Preliminary observations of velocity fields at the solar poles Preliminary observations of velocity fields at the solar poles

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..442c&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 442-454. NASA-supported research

Astronomy and Astrophysics

Astrophysics

22

Solar Granulation, Solar Velocity, Atmospheric Circulation, Convection, Cross Correlation, Doppler Effect, Low Pass Filters, Periodic Variations, Polar Regions, Solar Rotation, Spatial Filtering, Spectroheliographs, Velocity Distribution

Scientific paper

Using the 13 m Littrow spectrograph at Sacramento Peak Observatory, the Doppler shift of Fe I 5863 A in the polar regions of the sun over a 20 day interval is studied. The daily observations were assembled into a polar projection of the line-of-sight velocity field. The projection shows a very clear pattern of supergranulation. When a low-pass spatial filter is run over the data, a pattern of large-scale (80-100 Mm) velocity features can be seen. Cross-correlation studies show that the supergranular pattern rotates with a synodic period of 35 days, while there is evidence that the larger features rotate with a shorter period of about 30 days. At present, it is not possible to say whether the large-scale patterns represent a new scale of convection (possibly related to the dominant convective eddy in the lower solar convection zone) or to the low-wavenumber tail of a distribution of supergranular cells.

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