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Radius ekranirovaniya (debaevskii radius)

- harakternoe rasstoyanie D, na k-rom proishodit ekranirovanie kulonovskogo polya zaryada v plazme v rezul'tate togo, chto zaryad (napr., zaryad iona) okazyvaetsya preimushestvenno okruzhennym chasticami s zaryadom protivopolozhnogo znaka (v sluchae iona - elektronami). V masshtabah r>D plazma kvazineitral'na. R.e. (elektronnyi) $D_e=v_{e, tepl}/ \omega_{0e} = \sqrt{k T_e/4\pi N_e e^2}\approx 7\sqrt{T_e/N_e}$ (sm), gde N_e - chislo elektronov v 1 sm³ , T_e - temp-ra elektronov v kel'vinah, v_e,tepl - skorost' ih teplovogo dvizheniya, $\omega_{0e}$ - lengmyurovskaya chastota (podrobnee ob etom sm. v st. Plazma).

V kosmich. usloviyah R.e. mozhet dostigat' znachit. velichin. V sravnitel'no plotnoi plazme solnechnoi korony s $N_e \sim 10^8$ chastic/sm³ i $T\sim 10^6$ K debaevskii radius $D\approx 1$ sm, a v mezhzvezdnom prostranstve s $N_e \approx 10$ chastic/sm³ i $T\sim 10^4$ K (zony HII) $D\approx 150$ sm.

"Fizika Kosmosa", 1986
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