Michael Liemohn
Associate Professor
Atmospheric, Oceanic, and Space Sciences
University of Michigan
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Superthermal Electron Research Activities

This is how I began in space plasma physics, building a numerical code with Dr. George Khazanov (my PhD advisor) to simulate the flow of photoelectrons from the mid-latitude ionosphere through the magnetosphere and into the conjugate ionosphere. We looked at the factors controlling this magnetospheric passage, and quantified the plasmaspheric transparency for photoelectrons. We also coupled this code with a two-stream hydrodynamic code for the plasmasphere (by Steve Guiter) and examined the collisional and elctrodynamic coupling with the thermal particles. Lately, I have used this code along magnetic field lines near Mars to study the Mars-solar wind interaction.

Publications on superthermal electrons

2008

Coates, A. J., R. A. Frahm, D. R. Linder, D. O. Kataria, Y.Soobiah, G. Collinson, J. R. Sharber, J. D. Winningham, S. J. Jeffers, S. Barabash, J.-Z. Sauvaud, R. Lundin, M. Holmström, Y. Futaana, M. Yamauchi, A. Grigoriev, H. Andersson, H. Gunell, A. Fedorov, J.-J. Thocaven, T. L. Zhang, W. Baunjohann, E. Kallio, H. Koskinen, J. U. Kozyra, M. W. Liemohn, Y. Ma., A. Galli, P. Wurz, P. Bochsler, D. Brain, E. C. Roelof, P. Brandt, N. Krupp, J. Woch, M. Fraenz, E. Dubinin, X. McKenna-Lawler, S. Orsini, R. Cerulli-Irelli, A. Mura, A. Milillo, M. Maggi, C. C. Curtis, B. R. Sandel, K. C. Hsieh, K. Szego, A. Asamura, and M. Grande, Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS, Planet. Space Sci., 56, 802-806, 2008.

2007

Liemohn, M. W., Y. Ma, A. F. Nagy, J. U. Kozyra, J. D. Winningham, R. A. Frahm, J. S. Sharber, S. Barabash, and R. Lundin, Numerical modeling of the magnetic topology near Mars auroral observations, Geophys. Res. Lett., 34, L24202, doi: 10.1029/2007GL031806, 2007.

Frahm. R., J. R. Sharber, J. D. Winningham, P. Wurz, M. W. Liemohn, E. Kallio, M. Yamauchi, R. Lundin, S. Barabash, A. J. Coates, D. R. Linder, J. U. Kozyra, M. Holmström, S. J. Jeffers, H. Andersson, and S. McKenna-Lawler, Locations of atmospheric photoelectron energy peaks within the Mars environment, Space Sci. Rev., 126, 389-402, 2007.

Liemohn, M. W., Y. Ma, R. A. Frahm, X. Fang, J. U. Kozyra, A. F. Nagy, J. D. Winningham, J. R. Sharber, S. Barabash, and R. Lundin, Mars global MHD predictions of magnetic connectivity between the dayside ionosphere and the magnetospheric flanks, Space Sci. Rev., 126, 63-76, 2007.

2006

Liemohn, M. W., R. Frahm, J. D. Winningham, Y. Ma, S. Barabash, R. Lundin, J. U. Kozyra, A. F. Nagy, S. M. Bougher, J. Bell, D. Brain, D. Mitchell, J. Luhmann, M. Holmström, H. Andersson, M. Yamauchi, A. Grigoriev, S. M. P. McKenna-Lawlor, J. R. Sharber, J. R. Scherrer, S. J. Jeffers, A. J. Coates, D. R. Linder, D. O. Kataria, E. Kallio, H. Koskinen, T. Säles, P. Riihela, W. Schmidt, E. Roelof, D. Williams, S. Livi, C. C. Curtis, K. C. Hseih, B. R. Sandel, M. Grande, M. Carter, J.-A. Sauvaud, A. Fedorov, J.-J. Thocaven, S. Orsini, R. Cerulli-Irelli, M. Maggi, P. Wurz, P. Bochsler, N. Krupp, J. Woch, M. Fraenz, K. Asamura, C. Dierker, Numerical interpretation of high-altitude photoelectron observations, Icarus, 182, 383-395, 2006.

2003

Liemohn, M. W., D. L. Mitchell, A. F. Nagy, J. L. Fox, T. W. Reimer, and Y. Ma, Comparisons of electron fluxes measured in the crustal fields at Mars by the MGS MAG/ER instrument with a B-field dependent transport code, J. Geophys. Res., 108, 5134, doi: 10.1029/2003JE002158, 2003.

2002

Khazanov, G. V., and M. W. Liemohn, Transport of photoelectrons in the nightside magnetosphere, J. Geophys. Res., 107(A5), 1064, doi: 10.1029/2001JA000163, 2002.

2000

Khazanov, G. V., and M. W. Liemohn, Kinetic theory of superthermal electron transport, in Recent Research Developments in Geophysics, vol. 3 (part 2), edited by S. G. Pandalai, pp. 181-201, Research Signpost, Trivandrum, India, 2000.

Ganguli, G., M. A. Reynolds, and M. W. Liemohn, Recent advances in plasmaspheric research, J. Atmos Solar.-Terr. Physics, 62, 1647, 2000.

Khazanov, G. V., M. W. Liemohn, J. U. Kozyra, and D. L. Gallagher, Global energy deposition to the topside ionosphere from superthermal electrons, J. Atmos. Solar-Terr. Physics, 62, 947, 2000.

1998

Khazanov, G. V., M. W. Liemohn, J. U. Kozyra, and T. E. Moore, Inner magnetospheric superthermal electron transport: Photoelectron and plasma sheet electron sources, J. Geophys. Res., 103, 23,485, 1998.

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.

Khazanov, G. V., and M. W. Liemohn, Comparison of photoelectron theory against observations, Geospace Mass and Energy Flow, Geophys. Monogr. Ser., vol. 104, edited by J. L. Horwitz, D. L. Gallagher, and W. K. Peterson, p. 333, AGU, Washington, D. C., 1998.

Liemohn, M. W., G. V. Khazanov, and J. U. Kozyra, Banded electron structure formation in the inner magnetosphere, Geophys. Res. Lett., 25, 877, 1998.

1997

Liemohn, M. W., G. V. Khazanov, and J. U. Kozyra, Guided plasmaspheric hiss interactions with superthermal electrons, 1, Resonance curves and timescales, J. Geophys. Res., 102, 11,619, 1997.

Liemohn, M. W., G. V. Khazanov, T. E. Moore, and S. M. Guiter, Self-consistent superthermal electron effects on plasmaspheric refilling, J. Geophys. Res., 102, 7523, 1997.

Khazanov, G. V., M. W. Liemohn, and T. E. Moore, Photoelectron effects on the self-consistent potential in the collisionless polar wind, J. Geophys. Res., 102, 7509, 1997.

1996

Khazanov, G. V., T. E. Moore, M. W. Liemohn, V. K. Jordanova, and M.-C. Fok, Global collisional model of high-energy photoelectrons, Geophys. Res. Lett., 23, 331, 1996.

1995

Liemohn, M. W., and G. V. Khazanov, Nonsteady state coupling processes in superthermal electron transport, Cross-Scale Coupling in Space Plasmas, Geophys. Monogr. Ser., vol. 93, edited by J. L. Horwitz, N. Singh, and J. L. Burch, p. 181, AGU, Washington, D. C., 1995.

Khazanov, G. V., and M. W. Liemohn, Nonsteady state ionosphere-plasmasphere coupling of superthermal electrons, J. Geophys. Res., 100, 9669, 1995.

1993

Khazanov, G. V., M. W. Liemohn, T. I. Gombosi, and A. F. Nagy, Non-steady-state transport of superthermal electrons in the plasmasphere, Geophys. Res. Lett., 20, 2821, 1993.