Mathematics – Probability
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0604w&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0604
Mathematics
Probability
2731 Magnetosphere: Outer, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet
Scientific paper
Cluster fluxgate magnetometer (FGM) data are employed to construct probability distribution functions from magnetic field differences. This simple laboratory plasma technique is used to look for plasma turbulence. We examined the distribution of the magnetic field differences between pairs of highly correlated Cluster times series magnetometer data in both the plasma sheet and lobe regions. The unique Cluster spacecraft configuration allows for the examination of up to 6 spacecraft pairs for small scale sizes relative to the turbulent eddy scales during Cluster's passages through the magnetotail region in the summer of 2001. The determined distribution functions in the plasma sheet clearly do not resemble the expected normal distribution, but is well fit by a Poisson distribution or a log-normal distribution. The lobe probability distribution functions of the magnetic field times series difference, however, more closely resemble a normal distribution of the random magnetic fluctuations. These results suggest that magnetic field line turbulence is occurring within the plasma sheet resulting in turbulent energy dissipation, which is potentially due to plasma velocity shears [Borovsky et al., 1997].
Balogh André
Borovsky Joseph
Galland Kivelson Margaret
Goldstein Michel L.
Khurana Krishan K.
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