Erratum to: “Effect of negative ions on dust-acoustic soliton in a dusty plasma” [Phys. Lett. A 339 (2005) 96

Abstract

Due to a code error in calculation of the net space charge distribution, Fig. 7 of the Letter [1] should be replaced. The corrected Fig. 7 is shown below. Thus, it is very clear that the net space charge is positive in the boundary region, corresponding to the upward curve of Φ in Fig. 4 of Ref. [1], while it is negative in the central region, corresponding to the downward curve of Φ in Fig. 4 of Ref. [1]. The nnet/n+0 = 0 point between negative and positive regions corresponds to the inflection point of Φ . These correspondences can be obtained qualitatively from Eq. (13) in Ref. [1]. One can find the total net charge in the soliton is zero, which ensures that there is no electric field outside. Therefore, the related context in the last paragraph but two of the Letter, “With the dust density parameter αd fixed, . . . more dust grains are pushed into the region to balance their total charge loss.”, should be replaced as follows. With the dust density parameter αd fixed, in the central region the total negative charge has a trend to get lower, i.e., more negative, to make the magnitude of the traveling plasma potential higher. Indeed, the net charge in the central region is negative and its magnitude is higher in the α− = 0.4 case than that in the α− = 0.0 case as shown in Fig. 7. One can notice that there is the extra positive charge in the soliton boundary region but the negative in the central region. Thus, that the total net space charge is zero in the soliton ensures that there is no electric field outside.