Ring Current Modeling during Geomagnetic Storms


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Magnetospheric convection electric field variability during the Jan 1997 magnetic storm


Magnetic storms are characterized by a pronounced intensification of the global magnetospheric electric field, driven by disturbed solar wind conditions.  The electric field causes an intensification of the energy density of ring current ions in the inner magnetosphere. Following the storm these ions are removed by charge exchange and wave-particle scattering processes. In collaboration with V. Jordanova (LANL) we are attempting to understand the processes responsible for ring current formation and decay during storms.


Recent Publications:


Thorne, R. M., R. B. Horne, V. K. Jordanova, J. Bortnik, S. A. Glauert, Interaction of EMIC waves with thermal plasma and radiation belt particles, in Magnetospheric ULF Waves; Synthesis and New Directions, Geophys. Monogr. Ser., vol. 169, edited by K. Takahashi, P. J. Chi, R. E. Denton, and R. L. Lysak, pp 213-223, AGU, Washington, D. C., 2006.

Jordanova, V. K., A. Boonsiriseth, R. M. Thorne, and Y. Dotan, Ring Current Asymmetry From Global Simulations Using AMIE Potentials, J. Geophys. Res., 108, 1443, doi:10.1029/2003JA009993, 2003.

Jordanova, V. K., R. M. Thorne, C. J. Farrugia, Y. Dotan, J. F. Fennell, M. F. Thomsen, G. D. Reeves, and D. J. McComas, Ring current dynamics during the July 13-18, 2000 storm period, Solar Phys., 204, 361-375, 2001.

Boonsiriseth, A., R. M. Thorne, G. Lu, V. K. Jordanova, M. F.Thomsen, D. M. Ober, and A. J. Ridley,  A semi-empirical equatorial mapping of AMIE convection electric potentials (MACEP) for the January 10, 1997 magnetic storm,  J. Geophys., Res., 106, 12903-12917,  2001.

Jordanova, V. K., C. J. Farrugia, R. M. Thorne, G. V. Khazanov, G. D. Reeves, and M. F. Thomsen, Modeling ring current protons precipitation by EMIC waves during the May 14-16, 1997 storm. J. Geophys. Res., 106, 7-22, 2001.

Daglis, I. A., R. M. Thorne, W. Baumjohan, and S. Orsini, The terrestrial ring current: Origin, formation and decay, Revs. Geophys., 37, 407-438, 1999.

Thorne, R. M., and R. B. Horne,  "Modulation of electromagnetic ion cyclotron instability due to interaction with ring current O+ during geomagnetic storms," J. Geophys. Res., 102, 14155-14163, 1997.