What did Cluster discover in the solar wind?

Statistics – Applications

Scientific paper

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2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma

Scientific paper

The Cluster mission consists of four grouped spacecraft which are observing the Earth's magnetosphere and the near-Earth solar wind. Their unique configuration provides full three dimensional spatial resolution in space plasma, and Cluster can be used as a powerful tool to study physical processes in solar wind turbulence. One of the aims of turbulence studies is to estimate physical quantities like energy directly in three dimensional wave number domain. Although measurements at four points are not sufficient to perform the Fourier transform from spatial coordinates into wave vectors, a projection method called the wave telescope can be used as its equivalent alternative in order to determine experimentally dispersion relations, energy distributions, energy spectra, and bispectra in the wave number domain. We review these analysis methods on an elementary level as well as applications to and results from Cluster observations, which provides us with a new picture of solar wind turbulence.

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