from Physics News of American Institute of Physics [link]
Turbulence in space has been directly measured by a
suite of 4 satellite detectors, called Cluster, which are positioned
just outside the bow shock ahead of Earth’s magnetosphere. Cluster
measures rapid variations in the magnetic field as solar wind particles
arrive in Earth’s vicinity..
Reported by: Narita et al., Physical Review Letters, 10 November 2006
Read more: http://www.aip.org/pnu/2006/split/802-2.html