Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...693l.118p&link_type=abstract
The Astrophysical Journal Letters, Volume 693, Issue 2, pp. L118-L121 (2009).
Astronomy and Astrophysics
Astronomy
11
Cosmic Rays, Diffusion, Shock Waves, Turbulence
Scientific paper
We investigate the propagation of 0.54-3.5 MeV ions accelerated at the termination shock of the solar wind. Data are from Voyager 2 and refer to a time interval about one year long, just before the Voyager 2 termination shock crossing at the end of 2007 August, at roughly 83.7 AU. A recently developed technique, which allows to unravel the transport properties from an analysis of the energetic particle time profiles, is used. The ion time profiles exhibit a power-law decay from a few days to 200 days before the shock front, so that transport is found to be superdiffusive, with a mean square deviation growing like langΔx 2rang vprop t α, with α ~ 1.3. This means that ion propagation in the heliosphere can be intermediate between normal diffusion and ballistic motion. The implication of ion superdiffusion on particle acceleration mechanisms at the termination shock is discussed, as well as some observational evidence coming from both Voyager 1 and Voyager 2, which questions diffusive shock acceleration.
Perri Silvia
Zimbardo Gaetano
No associations
LandOfFree
Ion Superdiffusion at the Solar Wind Termination Shock 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 Ion Superdiffusion at the Solar Wind Termination Shock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ion Superdiffusion at the Solar Wind Termination Shock will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1399662