Sign-Singularity of the Reduced Magnetic Helicity in the Solar Wind Plasma

Details Sign-Singularity of the Reduced Magnetic Helicity in the Solar Wind Plasma Sign-Singularity of the Reduced Magnetic Helicity in the Solar Wind Plasma

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvl.104r1101c&link_type=abstract

Physical Review Letters, vol. 104, Issue 18, id. 181101

Physics

4

Solar Wind Plasma, Sources Of Solar Wind, Plasma Turbulence, Systems Obeying Scaling Laws, Turbulence

Scientific paper

We investigate the scaling laws of a signed measure derived from the reduced magnetic helicity which has been determined from Cluster data in the solar wind. This quantifies the handedness of the magnetic field; namely, it can be related to the polarization of the magnetic field fluctuations (right or left hand). The measure results to be sign-singular; that is, we do not observe any scale-dependent effect at the ion- and at electron-cyclotron frequencies. Cancellations between right- and left-hand polarizations go on in the dispersive or dissipative range, beyond the electron-cyclotron frequency. This means that the mechanism responsible for the generation of the dispersive or dissipative range is rather insensitive to the polarization of the magnetic field fluctuations.

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