Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..247l&link_type=abstract
Astronomy and Astrophysics, v.378, p.247-250 (2001)
Astronomy and Astrophysics
Astrophysics
2
Sun: Photosphere
Scientific paper
The photospheric intensity field, obtained from THEMIS-IPM observations, is analysed. We investigate the scaling behavior of intensity fluctuations, following an approach which is used in the study of passive scalar fluctuations in fully turbulent flows. By means of the methods which are applied in the study of multifractal measures, it is shown that the intensity fluctuations are characterised by anomalous scaling laws, identified by defining a dissipation field in analogy with the dissipation of passive scalar fluctuations in fluids. It is shown, finally, that this field is more intermittent in the higher photospheric layers than in the lower ones. Based on observations made with THEMIS-CNRS/INSU-CNR operated on the island of Tenerife by THEMIS S.L. in the Spanish Observatorio del Teide of the Instituto de Astrofisica de Canarias.
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