Measurement of Phase Coherence in Space Turbulence

Details Measurement of Phase Coherence in Space Turbulence Measurement of Phase Coherence in Space Turbulence

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1645b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1645

Physics

1872 Time Series Analysis (3270, 4277, 4475), 3379 Turbulence (4490), 4490 Turbulence (3379, 4568, 7863), 4568 Turbulence, Diffusion, And Mixing Processes (4490), 7863 Turbulence (4490)

Scientific paper

In many space plasmas such as Magnetosheath, intense magnetic fluctuations are permanently observed, with power law spectra. Assuming these fluctuations belong to some kind of turbulence, which can legitimately be suspected, spectra are clearly not sufficient to characterize it. Is this turbulence made of non linear "phase-coherent" structures, like in the classical Kolmogorov image, or is it made of incoherent waves as in weak turbulence? Is it homogeneous in space and scales or is it intermittent? " Many methods allow analyzing the statistical properties of turbulence, and the results obtained by tools such as structure functions or wavelets are of course influenced by all these properties, such providing indirect information about them. But few of them are specifically dedicated to the study of phase coherence so that the consequences that can be inferred from them are generally not univocal for this point of view. We will review those few tools existing in the literature that allow measuring more directly the phase coherence and present a new method, called "phase gradient analysis", which we are presently developing for this analysis. Preliminary results of this new tool will be presented.

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