Physics – Plasma Physics
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.5135h&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A3, p. 5135-5140
Physics
Plasma Physics
6
Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Turbulence
Scientific paper
The distribution of magnetic field magnitudes is derived for the special case of a constant mean field and uncorrelated components having Gaussian distributions. Of the three cases considered (isotropic, transverse, and axisymmetric) the latter most closely resembles a lognormal distribution when the parallel variance is less than the perpendicular variance. Thus a normally distributed, nonintermittent vector field can produce a magnitude distribution that closely resembles a functional form often associated with models of intermittency. This result is illustrated by comparison with a magnetic field magnitude distribution computed from the 1 AU Omni dataset. The parameters of the Gaussian component magnitude distribution can be chosen to compare with the data which is also well fit as a lognormal type. We conclude that the magnitude distribution may not be a sensitive indicator of intermittency and that further examination of the sensitivity of such indicators is warranted.
Hartlep Thomas
Matthaeus William H.
Padhye N. S.
Smith Walter C.
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