THE DYNAMICS OF CHARGED-PARTICLES IN TURBULENT ASTROPHYSICAL PLASMAS

Citation
R. Dung et V. Petrosian, THE DYNAMICS OF CHARGED-PARTICLES IN TURBULENT ASTROPHYSICAL PLASMAS, The Astrophysical journal, 421(2), 1994, pp. 550-560
Citations number
27
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
421
Issue
2
Year of publication
1994
Part
1
Pages
550 - 560
Database
ISI
SICI code
0004-637X(1994)421:2<550:TDOCIT>2.0.ZU;2-3
Abstract
We consider the resonant interaction of energetic charged particles an d transverse plasma wave propagating parallel and/or antiparallel to t he uniform magnetic field B-0 in an underlying background plasma of de nsity n. The coupling of the plasma waves and the energetic particles will be controlled by the ratio n/\B-0\(2). A variation of this ratio leads to a strong variation of the dynamics of the energetic particles . By taking into account the whole transverse plasma branch for the re sonant interaction we discuss the influence of the background plasma d ensity, the background magnetic field, the cross helicity, and the mag netic helicities on the dynamics of charged particles in astrophysical plasmas. It is shown that low-energy electrons can be accelerated eff iciently by the higher electromagnetic waves and short-wavelength whis tlers for low values of the ratio n/\B-0\(2), which means for low valu es of the ratio of plasma frequency to gyrofrequency.