Cosmic ray diffusion tensor throughout the heliosphere

Details Cosmic ray diffusion tensor throughout the heliosphere Cosmic ray diffusion tensor throughout the heliosphere

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11503103p&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A3, CiteID A03103

Physics

Plasma Physics

12

Space Plasma Physics: Transport Processes, Space Plasma Physics: Turbulence (4490), Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Energetic Particles (2114)

Scientific paper

We calculate the cosmic ray diffusion tensor based on a recently developed model of magnetohydrodynamic (MHD) turbulence in the expanding solar wind. Parameters of this MHD model are tuned by using published observations from Helios, Voyager 2, and Ulysses. We present solutions of two turbulence parameter sets and derive the characteristics of the cosmic ray diffusion tensor for each. We determine the parallel diffusion coefficient of the cosmic rays following the method presented by Bieber et al. (1995). We use the nonlinear guiding center theory to obtain the perpendicular diffusion coefficient of the cosmic rays. We find that (1) the radial mean free path decreases from 1 to 30 AU for both turbulence scenarios; (2) after 30 AU the radial mean free path is nearly constant; (3) the radial mean free path is dominated by the parallel component before 30 AU, after which the perpendicular component becomes important; (4) the rigidity dependence of the parallel mean free path is proportional to P.404 for one turbulence scenario and P.374 for the other at 1 AU from 0.1 to 10 GV, but in the outer heliosphere its dependence steepens above 4 GV; and (5) the rigidity dependence of the perpendicular mean free path is very weak.

Affiliated with

Also associated with

No associations

Rating

Cosmic ray diffusion tensor throughout the heliosphere 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 Cosmic ray diffusion tensor throughout the heliosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic ray diffusion tensor throughout the heliosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-883899