Mesogranulation and Turbulence in Photospheric Flows

Details Mesogranulation and Turbulence in Photospheric Flows Mesogranulation and Turbulence in Photospheric Flows

2001-04-21

arxiv.org/abs/astro-ph/0104354v1

Astronomy and Astrophysics

Astrophysics

Accepted for Solar Physics. 16 pages including 7 figures

Scientific paper

Below the scale of supergranules we find that cellular flows are present in the solar photosphere at two distinct size scales, approximately 2 Mm and 4 Mm, with distinct characteristic times. Simultaneously present in the flow is a non-cellular component, with turbulent scaling properties 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.

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