Physics – Plasma Physics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dppup6022s&link_type=abstract
American Physical Society, 50th Annual Meeting of the Division of Plasma Physics, November 17-21, 2008, abstract #UP6.022
Physics
Plasma Physics
Scientific paper
We simulate decaying kinetic Alfv'en wave turbulence in a strong guide field, appropriate for modeling interstellar turbulence at scales <=10ρs. Ion flow decouples from the system at these scales, while electron density (ne) fluctuations equipartition with the magnetic field. Stable circularly symmetric structures form in J, B and ne fields after a few Alfv'en times; nonlinear magnetic shear prevents turbulence from mixing the structures into the background and allow the structures to persist for many Alfv'en times. J filaments are large in amplitude and spatially localized, and their associated B and ne structures are less localized, consistent with the Biot-Savart law and KAW equipartitioning. Ensemble-averaged pdfs indicate ne and ∇ne deviate strongly from Gaussian statistics following the onset of structure formation. The non-Gaussian ∇ne statistics are especially of interest as a possible explanation of τD^4 scaling of pulsar signal widths τ with distance-to-source D.---Work supported by NSF.
Smith Kurt
Terry Paul
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