出典:Wikipedia
出典:『Wikipedia』 (2011/04/02 22:43 UTC 版)
Fermi acceleration , sometimes referred to as diffusive shock acceleration (a subclass of Fermi acceleration), is the acceleration that charged particles undergo when being repeatedly reflected, usually by a magnetic mirror. This is thought to be the primary mechanism by which particles gain non thermal energies in astrophysical shock waves. It plays a very important role in many astrophysical models, mainly of shocks including solar flares and supernova remnants. It is studied by using the Fermi-Ulam model.