Cancellation exponents and multifractal scaling laws in the solar wind magnetohydrodynamic turbulence |
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Authors: | V Carbone R Bruno |
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Institution: | (1) Dipartimento di Fisica, Universitá della Calabria, 87100 Cosenza, Italy;(2) Istituto di Fisica della Spazio Interplanetario/CNR, c.p. 27, 00044 Frascati, Italy |
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Abstract: | Some signed measures in turbulence are found to be sign-singular, that is their sign reverses continuously on arbitrary finer scales with a reduction of the cancellation between positive and negative contributions. The strength of the singularity is characterized by a scaling exponent , the cancellation exponent. In the present study by using some turbulent samples of the velocity field obtained from spacecraft measurements in the interplanetary medium, we show that sign-singularity is present everywhere in low-frequency turbulent samples. The cancellation exponent can be related to the characteristic scaling laws of turbulence. Differences in the values of , calculated in both high- and low-speed streams, allow us to outline some physical differences in the samples with different velocities. |
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