ABSTRACT
The last condition means that in quasineutral plasmas space charge does not accumulate, and current is to be vortex. After substituting the expressions for particle fluxes from Eq. (4.2), the Eq. (4.3) yields
(4.4)
Potential which satisfies the linear Eq. (4.4) can be sought in the form q>=q>^ f(pc. Here qv is the diffusive part of the potential corresponding to the absence of the current in plasma
(4.5)
The part <pc satisfies Eq. (4.4) with the r.h.s. at zero,
(4.6)
and corresponds to the external current through plasma. When there is no such current <pe=0 , and the fluxes of both species are equal everywhere: f e = f , . Since, according to Eq. (2.89), die mobilities b, and bt depend on density in a similar way, even in partially ionized plasma with density dependent mobilities, the part <pc does not contribute to the Eq. (4.1) because V • [n(be + bt )V<pc ]= V • («fe€V<pc ) = V • (nbtVipc) = 0.
