@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000775, author = {Miura, Akira}, issue = {8}, journal = {Journal of geophysical research. A}, month = {Aug}, pages = {18793--18806}, title = {Conditions for the validity of the incompressible assumption for the ballooning instability in the long-thin magnetospheric equilibrium}, volume = {105}, year = {2000} }