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Astron. Astrophys. 344, L33-L36 (1999)

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Letter to the Editor

Scaling behavior of the vertical velocity field in the solar photosphere *

G. Consolini 1, V. Carbone 2, F. Berrilli 3, R. Bruno 1, B. Bavassano 1, C. Briand 4, B. Caccin 3, G. Ceppatelli 4, A. Egidi 3, I. Ermolli 5, A. Florio 5, G. Mainella 1 and E. Pietropaolo 6

1 Istituto di Fisica dello Spazio Interplanetario - CNR, I-00133 Roma, Italy
2 Dipartimento di Fisica and Istituto Nazionale di Fisica della Materia, Universitá della Calabria, I-87036 Rende, Cosenza, Italy
3 Dipartimento di Fisica, Universitá degli Studi di Roma "Tor Vergata", I-00133 Roma, Italy
4 THEMIS, Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, Spain
5 Osservatorio Astronomico di Roma, I-00136 Roma, Italy
6 Dipartimento di Fisica, Universitá degli Studi, Localitá Coppito, I-67010 L'Aquila, Italy

Received 8 January 1999 / Accepted 5 March 1999


We analyze, for the first time, the scaling behavior of the photospheric vertical velocity field. Our analysis is based on data collected by the Italian Panoramic Monocromator (IPM) mounted at the THEMIS telescope at the Spanish "Observatorio del Teide" (Tenerife) of the Instituto de Astrofisica de Canarias. We investigate the occurrence of scaling in the cancellations between downflow and upflow of the vertical velocity field, showing that the field possesses well pronunced sign-singularity in the range of scales from more than 10 Mm down to the granulation scale.

Key words: Sun: photosphere – turbulence – Sun: granulation

* Based on THEMIS/CNRS-INSU/CNR telescope observations

Send offprint requests to: consolini@ifsi.rm.cnr.it

© European Southern Observatory (ESO) 1999

Online publication: March 18, 1999