Ln. Tsintsadze et al., A NEW LOW-FREQUENCY ELECTROSTATIC MODE IN A NONUNIFORM ELECTRON-POSITRON PLASMA, Astrophysics and space science, 222(1-2), 1994, pp. 259-261
The existence of a novel low-frequency electrostatic mode, which is du
e to the gravitational acceleration in a nonuniform electron-positron
plasma, is pointed out. At large amplitudes, the unstable modes self-o
rganize to form dipolar vortices.