of the Field length, so that the thickness becomes larger.

Acknowledgement {#acknowledgement .unnumbered}
===============

We thank the referee for valuable comments. We thank Dr. Tsuyoshi Inoue and Dr. Jennifer M. Stone for variable discussions. This work was supported by Grants-in-Aid for Scientific Research from the MEXT of Japan (K.I.:22864006; S.I.:18540238 and 16077202).

Audit, E., & Hennebelle, P. 2005, A&A, 433, 1

Audit, E., & Hennebelle, P. 2010, A&A, 511, 76

Balbus, S. A. 1986, ApJ, 303, 79

Begelman, M. C., & McKee, C. F. 1990, ApJ, 358, 375

Elphick, C., Regev, O., & Shaviv, N. 1992, ApJ, 392, 106

Ferrara, A., & Shchekinov, Yu. A. 1993, ApJ, 417, 595

Field, G. B. 1965, ApJ, 142, 531

Field, G. B., Goldsmith, D. W., & Habing, H. J. 1969, ApJ, 155, L149

Gazol, A., V[á]{}zquez-Semadeni, E., & Kim, J. 2005, ApJ, 630, 911

Graham, R., & Langer, W. D. 1973, ApJ, 179, 469

Heitsch, F., Burkert, A., Hartmann, L., Slyz, A., & Devriendt, J. 2005, ApJ, 633, 113

Heitsch, F., Slyz, A., Devriendt, J., Hartmann, L., & Burkert, A. 2006, ApJ, 647, 1052

Heitsch, F., Stone, J., & Hartmann, L. 2009, ApJ, 695, 248

Hennebelle, P., & Audit, E. 2007, A&A, 465, 