Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..dpplp1069s&link_type=abstract
American Physical Society, 47th Annual DPP Meeting, October 24-28, 2005, abstract #LP1.069
Physics
Scientific paper
Pulsar radio signal broadening by interstellar turbulence is consistent with non Gaussian density fluctuations at small scales. We examine physical mechanisms responsible for the inferred intermittency from a model for kinetic Alfv'en wave (KAW) turbulence. KAW turbulence characterizes density fluctuations at scales smaller than the ion gyroradius. Intermittency at these scales requires a mechanism for supporting localized structures against turbulent mixing in the absence of significant flows or ion forces. We first investigate decaying turbulence by formulating a two-time scale description of slowly evolving localized current filaments in rapidly evolving KAW turbulence. If the magnetic field shear of a filament is sufficiently strong, refraction of random kinetic Alfv'en waves localizes them to the edge of the filament and strongly reduces the anomalous diffusion of the filament, allowing the filament to remain coherent. This process also applies to the density perturbation associated with the current filament. A condition for coherency is derived for comparison with simulation data. Work supported by NSF
No associations
LandOfFree
Dynamical Origin of Small-Scale Intermittent Density Fluctuations in Interstellar Medium does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dynamical Origin of Small-Scale Intermittent Density Fluctuations in Interstellar Medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamical Origin of Small-Scale Intermittent Density Fluctuations in Interstellar Medium will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1620424