Vol. 1, No 1, 1994 pp. 12 - 17
UDC
533.9
SOME CHARACTERISTICS OF THE ION-ION HYBRID INSTABILITY IN WEAKLY IONIZED TWO-ION PLASMAS
D.Ž. Gajić1 and B.S. Milić2
1Faculty of Philosophy, Dept. of Physics, Ćirila i Metodija 2, 18000 Niš
2Faculty of Physics, P.O.B. 550, 11001 Beograd
Abstract. The ion-ion hybrid (IIH) modes are studied theoretically, on the ground of kinetic equations with BGK model collision integrals, in weakly ionized, magnetized, uni¬form and infinite two-ion plasmas. Attention is focused on the longwave domain (modal wavelengths larger than electron mean-free-path, and general expressions for the spectra and the instability criteria are derived. Apart from the Buchsbaum mode (ω ≈ ωB) known long ago, modes pertaining to higher-order Buchsbaum harmonics (ω ≈ NωB, N = 1,2,3,...) could also be studied, owing to the kinetic (rather than hydro- dynamic) approach. Particular consideration is given to the situations characterized by << which can only be studied kinetically.
NEKE KARAKTERISTIKE JON-JONSKIH HIBRIDNIH NESTABILNOSTI U SLABO JONIZOVANIM PLAZMAMA SA DVE VRSTE JONA
Teorijski se proučavaju jon-jonski hibridni modovi u slabo jonizovanoj, zamagnetisanoj, homogenoj i beskonačnoj plazmi, na osnovu kinetičkih jednačina sa modelnim kolizionim integralom BGK. Pažnja je koncentrisana na dugotalasno područje (talasne dužine veće od srednjeg slobodnog puta elektrona, ), za koje su izvedeni opšti izrazi za spektre i kriterijume nestabilnosti. Osim Buchsbaumovog moda (ω ≈ ωB) koji je poznat i od ranije, bilo je moguće, zahvaljujući kinetičkom (a ne hidrodinamičkom) prilazu, izučavanje i modova koji odgovaraju višim Buchsbaumovim harmonicima (ω ≈ NωB, N = 1,2,3,...). Posebno je obraćena pažnja na situacije u kojima je dodatno zadovoljen uslov << i koje se mogu analizirati samo kinetički.
