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Scaling law of the reduced magnetic helicity in fast streams |
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| Authors: | S Perri V Carbone R Bruno |
| Institution: | a International Space Science Institute, Hallerstrasse 6, CH-3012, Bern, Switzerland b Dipartimento di Fisica, Università della Calabria - Via P. Bucci 31/C, I-87036 Rende, Italy c Swedish Institute of Space Physics, Box 537, SE-75121 Uppsala, Sweden d Istituto di Fisica dello Spazio Interplanetario/INAF, via Fosso del Cavaliere, Roma, Italy |
| Abstract: | The reduced magnetic helicity is a quantity related to the handedness of the magnetic field fluctuations. In the present paper we study the scaling law of the reduced magnetic helicity in fast streams in the solar wind by using high-resolution magnetic field data by the Ulysses spacecraft. We show that at high frequencies both the left-hand and the right-hand helicity survives, implying that there is no predominance of a single sign. In addition, the scaling law of the magnetic helicity exhibits a strong dependence on the data set analyzed and we do not observe any universal behavior. |
| Keywords: | Interplanetary magnetic fields Space plasma turbulence Stochastic processes |
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