In many turbulent systems the temperature behaves as a passive scalar advected by velocity field. In some previous works, dedicated to the study of the velocity and intensity patterns at the solar photosphere, it has been evidenced the existence of scaling features and intermittency in the spatial properties of the velocity and dissipation fields. Here, using broad-band intensity images acquired at the French-Italian THEMIS telescope (Canarias - Spain) by the Italian Panoramic Monochromator, we investigate the features of the correlation time τ k at different wave numbers k. The results will be compared with the ones coming from field theoretic renormalization group (RG) applied to the problem of advected passive scalar fields.
On the Features of the Correlation Time at Different Wave Numbers in the Photosphere
PIETROPAOLO, Ermanno;
2001-01-01
Abstract
In many turbulent systems the temperature behaves as a passive scalar advected by velocity field. In some previous works, dedicated to the study of the velocity and intensity patterns at the solar photosphere, it has been evidenced the existence of scaling features and intermittency in the spatial properties of the velocity and dissipation fields. Here, using broad-band intensity images acquired at the French-Italian THEMIS telescope (Canarias - Spain) by the Italian Panoramic Monochromator, we investigate the features of the correlation time τ k at different wave numbers k. The results will be compared with the ones coming from field theoretic renormalization group (RG) applied to the problem of advected passive scalar fields.Pubblicazioni consigliate
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