Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21c..01m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH21C-01
Other
7807 Charged Particle Motion And Acceleration, 7843 Numerical Simulation Studies, 7859 Transport Processes, 7863 Turbulence
Scientific paper
Simulation studies show that there are sometimes discrepancies between parallel diffusion and QLT predictions. Here we study two effects that can help explain these features in terms of diffusion in velocity space. We present study of test particle's orbits in weak model magnetic turbulence. We calculate the diffusion coefficients in velocity space directly from test particle trajectories and compare them with theoretical results, examining both resonance gap and dynamnical turbulence effects, both of which have a strong influence on pitch angle scattering through 90 degrees. For magnetostatic turbulence, we find that trapping width theory [Karimabadi et al., 1992, JGR, 97:13853] can be used to explain such problem. We can show when turbulence level is large enough and trapping width overweighs the resonance gap, particle can be easily scattered back through 90 degree. This can be used to study the life time of a hemispherical velocity distribution. Dynamical turbulence is another way to solve such problems. Bieber et al. [1994, ApJ, 420:294] presented dynamical turbulence model and scattering theory for the mean free path of cosmic-ray scattering parallel to the mean magnetic field, and theory for the Fokker-Planck coefficient for pitch angle scattering. We present a numerical realization of the dynamical model turbulence suggested by Bieber et al and show test particle simulation results to confirm its effects on scattering at 90 degrees, and on hemispherical distributions. The work is supported by NASA grant NAG5-8134 (SEC Theory Program) and NSF grant ATM-0105254.
Bieber John W.
Matthaeus William H.
Qin Gan
No associations
LandOfFree
Resonance gap, dynamical turbulence and velocity space diffusion of charged test particles 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 Resonance gap, dynamical turbulence and velocity space diffusion of charged test particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resonance gap, dynamical turbulence and velocity space diffusion of charged test particles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1723160