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Al'vena chislo
13.08.2001 19:13 | "Fizicheskaya Enciklopediya"/Phys.Web.Ru

Al'vena chislo - bezrazmernaya velichina A, harakterizuyushaya dvizhenie provodyashei zhidkosti v magnitnom pole. Nazvano v chest' X. Al'vena (H. Alfven). Chislo Al'vena ravno otnosheniyu magnitnoi $\mathcal{E}_m=H^2/8\pi$ i kineticheskoi $\mathcal{E}_k=\rho v^2/2$ energii (N - napryazhennost' magnitnogo polya, $\rho$ - plotnost', v - skorost' zhidkosti):
$A=\mathcal{E}_m/ \mathcal{E}_k=H^2/4\pi\rho v^2$

Esli vvesti skorost' al'venovskih voln $v_A=H(4\pi\rho)^{\displaystyle-1/2}$ , to $A=(v_A/v)^2$ .

Publikacii s klyuchevymi slovami: magnitnaya gidrodinamika - Al'ven - Al'vena chislo Publikacii so slovami: magnitnaya gidrodinamika - Al'ven - Al'vena chislo
Sm. takzhe: Veter ot chernoi dyry Magnitogidrodinamika Radiacionnoe zatuhanie kolebanii koronal'nyh petel' Mezhzvezdnaya MGD-turbulentnost' Al'venovskie volny