  Turbulence develops in any stressed flow when the scales of the forcing are
much larger than those of the dissipation. In neutral fluids, it consists of
chaotic motions in physical space but with a universal energy spectrum in
Fourier space. Intermittency (non-Gaussian statistics of fluctuations) is
another general property and it is related to the presence of coherent
structures. Space plasmas are turbulent as well. Here, we focus on the kinetic
plasma scales, which are not yet well understood. We address the following
fundamental questions: (1) Do the turbulent fluctuations at kinetic scales form
a universal spectrum? and (2) What is the nature of the fluctuations? Using
measurements in the solar wind we show that the magnetic spectra of kinetic
turbulence at 0.3, 0.6 and 0.9 AU from the Sun have the same shape as the ones
close to the Earth orbit at 1 AU, indicating universality of the phenomenon.
The fluctuations, which form this spectrum, are typically non-linearly
interacting eddies that tend to generate magnetic filaments.
