 |
| Titel |
On the dispersion of two coexisting nongyrotropic ion species |
| VerfasserIn |
A. L. Brinca, U. Motschmann, F. J. Romeiras |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 9 ; Nr. 17, no. 9, S.1134-1144 |
| Datensatznummer |
250013806
|
| Publikation (Nr.) |
 copernicus.org/angeo-17-1134-1999.pdf |
|
|
|
|
|
| Zusammenfassung |
| Space observations in the solar wind and
simulations of high Mach number bow-shocks have detected particle populations
with two coexisting nongyrotropic ion species. We investigate the influence of
these two sources of free energy on the stability of parallel (with respect to
the ambient magnetic field) and perpendicular propagation. For parallel modes,
we derive their dispersion equation in a magnetoplasma with protons and alpha
particles that may exhibit stationary nongyrotropy (SNG) and discuss the
characteristics of its solutions. Kinetic simulations study the behaviour of
perpendicular electrostatic (Bernstein-like) waves in a plasma whose ion
populations (positrons and fictitious singly-charged particles with twice the
electron mass, for the sake of simulation feasability) can be time-varying
nongyrotropic (TNG). The results show that the coexistence of two gyrophase
bunched species does not significantly enhance the parallel SNG instability
already found for media with only one nongyrotropic species, whereas it strongly
intensifies the growth of Bernstein-like modes in TNG plasmas.
Key words. Magnetospheric physics (plasma waves and
instabilities) · Space plasma physics (numerical simulation studies; waves and
instabilities) |
| |
|
| Teil von |
|
|
|
|
|
|
|
|