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Solar-cycle variations in the spectrum of supergranulation

Published online by Cambridge University Press:  14 March 2005

Laurent Gizon  and
Thomas L. Duvall
Laurent Gizon
Affiliation:
Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA
Thomas L. Duvall
Affiliation:
Laboratory for Astronomy and Solar Physics, NASA/GSFC, Greenbelt, MA 20771, USA
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Abstract

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Using local helioseismology, we construct maps of the horizontal divergence of the velocity field near the solar surface and study the spectrum of solar supergranulation during the period from 1996 to 2002. Supergranulation oscillates and propagates like a wave interference pattern. The variations of the oscillation frequency with latitude and time are less than 5%. We find significant solar-cycle variations in the lifetime and the anisotropic distribution of power. We also measure the time-dependent zonal and meridional flows that advect supergranules.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS223 , June 2004 , pp. 41 - 44
Copyright
© 2004 International Astronomical Union