Physics – Plasma Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11210201w&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A10, CiteID A10201
Physics
Plasma Physics
11
Space Plasma Physics: Turbulence (4490), Magnetospheric Physics: Plasma Sheet, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Space Plasma Physics: Nonlinear Phenomena (4400, 6944)
Scientific paper
Cluster data from many different intervals in the magnetospheric plasmas sheet and the solar wind are employed to determine the magnetic Taylor microscale from simultaneous multiple point measurements. For this study we define the Taylor scale as the square root of the ratio of the mean square magnetic field (or velocity) fluctuations to the mean square spatial derivatives of their fluctuations. The Taylor scale may be used, in the assumption of a classical Ohmic dissipation function, to estimate effective magnetic Reynolds numbers, as well as other properties of the small scale turbulence. Using solar wind magnetic field data, we have determined a Taylor scale value of 2400 +/- 100 km, which is used to obtain an effective magnetic Reynolds number of about 260,000 +/- 20,000, and in the plasma sheet we calculated a Taylor scale of 1900 +/- 100 km, which allowed us to obtain effective magnetic Reynolds numbers in the range of about 7 to 110. The present determination makes use of a novel extrapolation technique to derive a statistically stable estimate from a range of small scale measurements. These results may be useful in magnetohydrodynamic modeling of the solar wind and the magnetosphere and may provide constraints on kinetic theories of dissipation in space plasmas.
Dasso Sergio
Galland Kivelson Margaret
Matthaeus William H.
Walker Ray J.
Weygand James M.
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