Sign-Singularity of the Reduced Magnetic Helicity in the Solar Wind Plasma
2010 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 104, no 18, 181101- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2010. Vol. 104, no 18, 181101- p.
IdentifiersURN: urn:nbn:se:uu:diva-147242DOI: 10.1103/PhysRevLett.104.181101ISI: 000277417500007OAI: oai:DiVA.org:uu-147242DiVA: diva2:400075