Turbulence in the solar wind as seen by Cluster CIS experiment: preliminary results on intermittency and scaling laws

Details Turbulence in the solar wind as seen by Cluster CIS experiment: preliminary results on intermittency and scaling laws Turbulence in the solar wind as seen by Cluster CIS experiment: preliminary results on intermittency and scaling laws

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..361p&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

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Solar Wind, Turbulence

Scientific paper

One of the most interesting features of solar wind turbulence is the intermittent character of its velocity fluctuations. A direct consequence of this would imply that small eddies are less and less space filling if turbulence is looked at in the framework of a classical Richardson's cascade. This phenomenon would cause solar wind turbulence to be intermittently distributed in space. In other words, the global scale invariance required in the K41 theory would release towards a local scale invariance where different fractal sets characterized by different scaling exponents can be found. The first solar wind plasma measurements made by the CIS experiment onboard Cluster spacecraft reveal the existence of some differences of the intermittent character of the fluctuations as observed by two different spacecraft. Although these findings are based on a preliminary analysis and expect to be confirmed by a similar analysis performed on magnetic field data, our study fully confirms previous findings reported in literature that ascribe to the presence of the border between adjacent flux tubes an important role in the intermittency of solar wind fluctuations.

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