Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2003-07-22
Phys. Rev. E 69, 036214 (2004)
Nonlinear Sciences
Pattern Formation and Solitons
11 pages, 2 figures
Scientific paper
10.1103/PhysRevE.69.036214
We recently have proposed that a reduced interfacial model for streamer propagation is able to explain spontaneous branching. Such models require regularization. In the present paper we investigate how transversal Fourier modes of a planar ionization front are regularized by the electric screening length. For a fixed value of the electric field ahead of the front we calculate the dispersion relation numerically. These results guide the derivation of analytical asymptotes for arbitrary fields: for small wave-vector k, the growth rate s(k) grows linearly with k, for large k, it saturates at some positive plateau value. We give a physical interpretation of these results.
Arrayás Manuel
Ebert Ute
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