Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp41c02l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP41C-02
Physics
7529 Photosphere
Scientific paper
Cellular flows are present in the solar photosphere at two distinct size scales, 2 Mm and 4 Mm, with distinct characteristic times. Simultaneously present in the flow is a non-cellular component, with turbulent scaling properties between 1 Mm and 64 Mm, and containing 30 % of the flow energy. These results are obtained by means of wavelet spectral analysis and modeling of vertical photospheric motions in a 2-hour sequence of 120 SOHO/MDI, high resolution, Doppler images near disk center. The wavelets permit detection of specific local flow patterns corresponding to convection cells. Standard spectral techniques have difficulty resolving mesogranules for three basic reasons: (1) the mesogranules are near in scale to granules and weaker in velocity and (2) they are hidden by overlying turbulence because (3) global basis functions, such as Fourier waves or spherical harmonics, do not allow attention to be paid to the local topologies that label cellular flows.
Cadavid Carlos A.
Lawrence John K.
Ruzmaikin Aleksandr
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