Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh23c..02j&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH23C-02
Physics
Plasma Physics
[7835] Space Plasma Physics / Magnetic Reconnection, [7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves, [7859] Space Plasma Physics / Transport Processes
Scientific paper
A number of different mechanisms have been proposed for the acceleration of the various energetic charged particles observed and accelerated in the heliosphere. Examples of proposed mechanisms include diffusive shock acceleration, stochastic or 2nd-order Fermi acceleration, transit-time damping and reconnection event. These mechanisms may operate wherever the collisions are rare enought to permit the paricles to exist for many acceleration times. Because of the absence of collisions, the acceleration must be caused by the ambient electric field, which at the scales of interest, can be written in terms of the fluid velocity U, magnetic field B and the speed of light c as E = - U X B/c. Therefore, consideration of the observed SPATIAL AND TEMPORAL scales and the ambient fluid velocities in any given region, such as the heliosphere or inner heliosphere, constrains the attainable particle energies. For example, a large spatial scale or a high fluid velocity will be able to accelerate particles to higher energies than a smaller scale or lower velocity. These very general considerations, together with the observed energy spectra and composition, lead to significant constraints on the possible mechanisms in each case.
No associations
LandOfFree
Constraints on the Acceleration of Charged Particles in the Heliosphere (Invited) 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 Constraints on the Acceleration of Charged Particles in the Heliosphere (Invited), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on the Acceleration of Charged Particles in the Heliosphere (Invited) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1783190