- Open Access
Coulomb lifetime of the ring current ions with time varying plasmasphere
Earth, Planets and Space volume 50, pages371–382(1998)
We have developed a time-dependent model of the plasmasphere to evaluate the spatial variation of the Coulomb lifetime of ring current ions. Coulomb collision has been considered to be one of major loss processes of the ring current ions interacted with the thermal plasma in the plasmasphere. The distribution of plasmaspheric density is derived by a continuity equation under the hydrostatic assumption. The protons supplied from both conjugate ionospheres are drifted by a time-dependent convection field and a corotation electric field. Calculated profiles of the number density and the relative motion of the plasmasphere are in fairly good agreement with the observational results by EXOS-B satellite. We traced the energetic ions during a storm on June 4–8, 1991 and calculated the differential flux and the pressure to examine the loss effects on the pressure due to the both loss processes. We found that (1) the Coulomb collision loss restrictively affects at L ≤ 3 because the plasmasphere drastically shrank due to the strong convection, and that (2) there is no significant change in the ion composition ratio during the initial rapid recovery of Dst, i.e., the rapid recovery of Dst is not caused by the short charge exchange lifetime of O+ ions for this particular storm.
Banks, P. M. and G. Kockarts, Aeronomy, Part B, 355 pp., Academic Press, New York, 1973.
Baumjohann, W. and G. Paschmann, Average plasma properties in the central plasmasheet, J. Geophys. Res., 94, 6597–6606, 1989.
Bilitza, D., International reference ionosphere: Recent developments, Radio Sci., 21, 343–346, 1986.
Brice, N. M., Bulk motion of the magnetosphere, J. Geophys. Res., 72, 5193–5211, 1967.
Carpenter, D. L., Whistler studies of the plasmapause in the magnetosphere, J. Geophys. Res., 71, 693–709, 1966.
Carpenter, D. L. and R. R. Anderson, An ISEE/Whistler model of equatorial electron density in the magnetosphere, J. Geophys. Res., 97, 1097–1108, 1992.
Chamberlain, J. W., Planetary coronae and atmospheric evaporation, Planet. Space Sci., 11, 901–960, 1963.
Chappell, C. R., K. K. Harris, and G. W. Sharp, The morphology of the bulge region of the plasmasphere, J. Geophys. Res., 75, 3848–3861, 1970.
Chen, A. J. and R. A. Wolf, Effects on the plasmasphere of a time-varying convection electric field, Planet. Space Sci., 20, 483–509, 1972.
Cladis, J. B. and and W. E. Francis, The polar ionosphere as a source of the storm time ring current, J. Geophys. Res., 90, 3465–3473, 1985.
Daglis, I. A., S. Livi, E. T. Sarris, and B. Wilken, Energy density of ionospheric and solar wind origin ions in the near-Earth magnetotail during substorms, J. Geophys. Res., 99, 5691–5703, 1994.
Dessler, A. J. and E. N. Parker, Hydromagnetic theory of geomagnetic storms, J. Geophys. Res., 64, 2239–2252, 1959.
Ebihara, Y., H. Miyaoka, F. Tohyama, and M. Ejiri, Loss effects for energetic protons associated with a magnetic storm in the inner magnetosphere, Proc. NIPR Symp. Upper Atmos. Phys., 10, 16–28, 1997.
Ejiri, M., Trajectory traces of charged particles in the magnetosphere, J. Geophys. Res., 83, 4798–4810, 1978.
Ejiri, M., K. Tsuruda, Y. Watanabe, A. Nishida, and T. Obayashi, Impedance and electric field observations in the magnetosphere with satellite JIKIKEN(EXOS-B), J. Geomag. Geoelectr., 33, 101–110, 1981.
Fok, M.-C., J. U. Kozyra, A. F. Nagy, and T. E. Cravens, Lifetime of ring current particles due to Coulomb collisions in the plasmasphere, J. Geophys. Res., 96, 7861–7867, 1991.
Fok, M.-C., T. E. Moore, J. U. Kozyra, G. C. Ho, and D. C. Hamilton, Threedimensional ring current decay model, J. Geophys. Res., 100, 9619–9632, 1995.
Gallagher, D. L., P. D. Craven, R. H. Comfort, and T. E. Moore, On the azimuthal variation of core plasma in the equatorial magnetosphere, J. Geophys. Res., 100, 23597–23605, 1995.
Grebowsky, J. M. and A. J. Chen, Effects of convection electric field on the distribution of ring current type protons, Planet. Space Sci., 23, 1045–1052, 1975.
Grebowsky, J. M., Y. Tulunay, and A. J. Chen, Temporal variations in the dawn and dusk midlatitude trough and plasmapause, Planet. Space Sci., 22, 1089–1099, 1974.
Guiter, S. M., T. I. Gombosi, and C. E. Rasmussen, Two-stream modeling of plasmaspheric refilling, J. Geophys. Res., 100, 9519–9526, 1995.
Hedin, A. E., MSIS-86 thermospheric model, J. Geophys. Res., 92, 4649–4662, 1987.
Hedin, A. E., Extension of the MSIS thermosphere model into the middle and lower atmosphere, J. Geophys. Res., 96, 1159–1172, 1991.
Horwitz, J. L., R. H. Comfort, and C. R. Chappell, A statistical characterization of plasmasphere density structure and boundary locations, J. Geophys. Res., 95, 7937–7947, 1990.
Janev, R. K. and J. J. Smith, Cross sections for collision processes of hydrogen atoms with electrons, protons, and multipli-charged ions, Atomic and Plasma-Material Interaction Data for Fusion, IAEA, 4, 78–79, 1993.
Khazanov, G. V., M. A. Koen, Y. V. Konikov, and I. M. Sidorov, Simulation of ionosphere-plasmasphere coupling taking into account ion inertia and temperature anisotropy, Planet. Space Sci., 32, 585–598, 1984.
Kistler, L. M., F. M. Ipavich, D. C. Hamilton, G. Gloeckler, B. Wilken, G. Kremser, and W. Studemann, Energy spectra of the major ion species in the ring current during geomagnetic storms, J. Geophys. Res., 94, 3579–3599, 1989.
Lennartsson, W. and E. G. Shelley, Survey of 0.1-to 16-keV/e plasma sheet ion composition, J. Geophys. Res., 91, 3061–3076, 1986.
Li, W., J. J. Sojka, and W. J. Raitt, A study of plasmaspheric density distributions for diffusive equilibrium conditions, Planet. Space Sci., 31, 1315–1327, 1983.
Liemohn, H., The lifetime of radiation belt protons with energies between 1 keV and 1 MeV, J. Geophys. Res., 66, 3593–3595, 1961.
Lin, J., J. L. Horwitz, G. R. Wilson, C. W. Ho, and D. G. Brown, A semikinetic model for early stage plasmasphere refilling 2. Effects of waveparticle interactions, J. Geophys. Res., 97, 1121–1134, 1992.
Marubashi, K. and J. M. Grebowsky, A model study of diurnal behavior of the ionosphere and the protonosphere coupling, J. Geophys. Res., 81, 1700–1706, 1976.
Maynard, N. C. and A. J. Chen, Isolated cold plasma regions: Observations and their relation to possible production mechanisms, J. Geophys. Res., 80, 1009–1013, 1975.
Mayr, H. G., J. M. Grebowsky, and H. A. Taylor, Jr., Study of the thermal plasma on closed field lines outside the plasmasphere, Planet. Space Sci., 18, 1123–1135, 1970.
Moffett, R. J. and J. A. Murphy, Coupling between the F-region and protonosphere: Numerical solution of the time-dependent equations, Planet. Space Sci., 21, 43–52, 1973.
Moldwin, M. B., M. F. Thomsen, S. J. Bame, D. McComas, and G. D. Reeves, The fine-scale structure of the outer plasmasphere, J. Geophys. Res., 100, 8021–8029, 1995.
Nishida, A., Formation of plasmapause, or magnetospheric plasma knee, by the combined action of magnetospheric convection and plasma escape from the tail, J. Geophys. Res., 71, 5669–5679, 1966.
Olsen, R. C., S. D. Shawhan, D. L. Gallagher, J. L. Green, C. R. Chappell, and R. R. Anderson, Plasma observations at the Earth’s magnetic equator, J. Geophys. Res., 92, 2385–2407, 1987.
Peterson, W. K., R. D. Sharp, E. G. Shelley, and R. G. Johnson, Energic ion composition of the plasmasheet, J. Geophys. Res., 86, 761–767, 1981.
Rairden, R. L., L. A. Frank, and J. D. Craven, Geocoronal imaging with Dynamic Explorer, J. Geophys. Res., 91, 13613–13630, 1986.
Raitt, W. J., R. W. Schunk, and P. M. Banks, A comparison of the temperature and density structure in high and low speed thermal proton flows, Planet. Space Sci., 23, 1103–1117, 1975.
Rasmussen, C. E., S. M. Guiter, and S. G. Thomas, A two-dimensional model of the plasmasphere: refilling time constants, Planet. Space Sci., 41, 35–43, 1993.
Roeder, J. L., J. F. Fennell, M. W. Chen, M. Grande, S. Livi, and M. Schulz, CRRES observations of stormtime ring current ion composition, AIP Conf. Proc., Workshop on the Earth’s Trapped Particle Environment, No. 383, 131-135, 1996.
Roederer, J. G., Dynamics of Geomagnetically Trapped Radiation, 166 pp., Springer-Verlag, Berlin Heidelberg, 1970.
Sharp, R. D., W. Lennartsson, W. K. Peterson, and E. G. Shelley, The origins of the plasma in the distant plasma sheet, J. Geophys. Res., 87, 10420–10424, 1982.
Singh, N. and C. B. Chan, Effects of equatorially trapped ions on refilling of the plasmasphere, J. Geophys. Res., 97, 1167–1179, 1992.
Smith, P. H. and N. K. Bewtra, Charge exchange lifetimes for ring current ions, Space Sci. Rev., 22, 301–318, 1978.
Smith, P. H., R. A. Hoffman, and T. A. Fritz, Ring current proton decay by charge exchange, J. Geophys. Res., 81, 2701–2708, 1976.
Stern, D. P., The motion of a proton in the equatorial magnetosphere, J. Geophys. Res., 80, 595–599, 1975.
Takahashi, S., T. Iyemori, and M. Takeda, A simulation of the storm-time ring current, Planet. Space Sci., 38, 1133–1141, 1990.
Thomsen, M. F., J. E. Borovsky, D. J. McComas, and M. B. Moldwin, Observations of the Earth’s plasmasheet at geosynchronous orbit, AIP Conf. Proc., Workshop on the Earth’s Trapped Particle Environment, No. 383, 25-31, 1996.
Volland, H., A semiempirical model of large-scale magnetospheric electric fields, J. Geophys. Res., 78, 171–180, 1973.
Wentworth, R. C., W. M. MacDonald, and S. F. Singer, Lifetimes of trapped radiation belt particles determined by Coulomb scattering, Phys. Fluids, 2, 499–509, 1959.
Wilson, G. R., J. L. Horwitz, and J. Lin, A semikinetic model for early stage plasmasphere refilling 1. Effects of Coulomb collisions, J. Geophys. Res., 97, 1109–1119, 1992.
About this article
Cite this article
Ebihara, Y., Ejiri, M. & Miyaoka, H. Coulomb lifetime of the ring current ions with time varying plasmasphere. Earth Planet Sp 50, 371–382 (1998). https://doi.org/10.1186/BF03352123
- Charge Exchange
- Plasma Sheet
- International Reference Ionosphere
- Coulomb Collision
- Charge Exchange Cross Section