Turbulent adiabatic shock waves and diffusive particle acceleration

Citation
I. Lerche et al., Turbulent adiabatic shock waves and diffusive particle acceleration, J PLASMA PH, 64, 2000, pp. 459-474
Citations number
14
Categorie Soggetti
Physics
Journal title
JOURNAL OF PLASMA PHYSICS
ISSN journal
00223778 → ACNP
Volume
64
Year of publication
2000
Part
4
Pages
459 - 474
Database
ISI
SICI code
0022-3778(200010)64:<459:TASWAD>2.0.ZU;2-B
Abstract
We investigate the properties of turbulent adiabatic shock waves resulting from the self-consistent inclusion of finite Alfven-wave pressure in the sh ock balance equations. We demonstrate (i) the absence of a switch-on shock; (ii) the existence of two separated domains where the Mach number is great er than unity that have gas compression, and an associated domain where the gas compression ratio is less than unity (i.e. a rarefaction domain); (iii ) the difference between the scattering-centre compression ratio and the ga s compression ratio for all upstream wave cross-helicity values except for the isolated case of zero helicity; (iv) the presence of anomalous domains where the cosmic-ray particle spectral index can be negative. All of these results are brought about by including the upstream and downstream turbulen t wave energies in the shock balance structure. Without the waves, none of the effects persists.