Title: The usefulness of Poynting's theorem in magnetic turbulence,
Abstract: We rewrite Poynting's theorem, already used in a previous publication
(Treumann & Baumjohann 2017) to derive relations between the turbulent magnetic
and electric power spectral densities, to make explicit where the mechanical
contributions enter. We then make explicit use of the relativistic
transformation of the turbulent electric fluctuations to obtain expressions
which depend only on the magnetic and velocity fluctuations. Any electric
fluctuations play just an intermediate role. Equations are constructed for the
turbulent conductivity spectrum in Alfvénic and non-Alfvénic turbulence in
extension of the results in the above citation. An observation-based discussion
of their use in application to solar wind turbulence is given. The inertial
range solar wind turbulence exhibits signs of chaos and self-organisation.