Plasmasphere Research Activities
I study the interaction of the plasmasphere with other charged particle populations in near-Earth space, in particular the ring current. The plasmasphere is the cold (few eV or less) ions and electrons flowing out from the ionosphere that fill the inner magnetosphere. There is usually a sharp cutoff to the radial extend of this filling, known as the plasmapause, the location of which is controlled by the near-Earth electric field. The ring current, which controls the distortions of this field in the inner magnetosphere, is therefore very important to the dynamics of the plasmasphere. I have also studied the physics of plasmaspheric refilling.
Publications on the plasmasphere
Khazanov, G. V., K. V. Gamayunov, D. L. Gallagher, M. W. Liemohn, and J. U. Kozyra, Self-consistent model of magnetospheric ring current and propagating electromagnetic ion cyclotron waves, 2, Wave induced ring current precipitation and thermal electron heating, J. Geophys. Res., 112, A04209, doi: 10.1029/2006JA012033, 2007.
Liemohn, M. W., A. J. Ridley, J. U. Kozyra, D. L. Gallagher, M. F. Thomsen, M. G. Henderson, M. H. Denton, P. C. Brandt, and J. Goldstein, Analyzing electric field morphology through data-model comparisons of the GEM IM/S Assessment Challenge events, J. Geophys. Res., 111, A11S11, doi: 10.1029/2006JA011700, 2006.
Liemohn, M. W., A. J. Ridley, P. C. Brandt, D. L. Gallagher, J. U. Kozyra, D. G. Mitchell, E. C. Roelof, and R. DeMajistre, Parametric analysis of nightside conductance effects on inner magnetospheric dynamics for the 17 April 2002 storm, J. Geophys. Res., 110, A12S22, doi: 10.1029/2005JA011109, 2005.
Liemohn, M. W., A. J. Ridley, D. L. Gallagher, D. M. Ober, and J. U. Kozyra, Dependence of plasmaspheric morphology on the electric field description during the recovery phase of the April 17, 2002 magnetic storm, J. Geophys. Res., 109(A3), A03209, doi: 10.1029/2003JA010304, 2004.
Liemohn, M. W., J. U. Kozyra, P. G. Richards, G. V. Khazanov, M. J. Buonsanto, and V. K. Jordanova, Ring current heating of the thermal electrons at solar maximum, J. Geophys. Res., 105, 27,767, 2000.
Liemohn, M. W., J. U. Kozyra, G. V. Khazanov, and P. D. Craven, Effects of various transport processes on the streaming ion density during the first stage of plasmaspheric refilling, J. Atmos. Solar-Terr. Physics 62, 437, 2000.
Liemohn, M. W., and G. V. Khazanov, Determining the significance of electrodynamic coupling between superthermal electrons and thermal plasma, Geospace Mass and Energy Flow, Geophys. Monogr. Ser., vol. 104, edited by J. L. Horwitz, D. L. Gallagher, and W. K. Peterson, p. 343, AGU, Washington, D. C., 1998.