Abstract
The development of currents due to arbitrary distributions of trapped particles in the geomagnetic field is described. These currents form the Earth's ring current and are responsible for world wide decreases of the surface magnetic field observed during magnetic storms. It is shown that we do not yet know the relative abundances of the ions forming the ring current. Because of this we do not understand how various sources mix to produce the ring current. Several possible generation mechanisms are discussed. Finally, the decay of the ring current is discussed and is shown to be due primarily to charge exchange with important secondary effects attributable to wave-particle interactions.
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References
Akasofu, S. I. and Chapman, S.: 1961, J. Geophys. Res. 66, 1321.
Alfvén, H.: 1955, Tellus 7, 54.
Apel, J. R., Singer, S. F., and Wentworth, R. C.: 1962, Adv. Geophys. 99, 131.
Axford, W. I.: 1969, Rev. Geophys. 7, 421.
Berko, F. W., Cahill, L. J., Jr., and Fritz, T. A.: 1975, J. Geophys. Res. 80, 3549.
Carovillano, R. L. and Maguire, J. J.: 1968, in R. L. Carovillano, J. F. McClay, and H. R. Radoski (eds.), Physics of the Magnetosphere, D. Reidel Publ. Co., Dordrecht, Holland, p. 290.
Carovillano, R. L. and Siscoe, G. L.: 1973, Rev. Geophys. Space Phys. 11, 289.
Chapman, S. and Ferraro, V. C. A.: 1931, Terr. Magn. Atmos. Elec. 36, 77 and 171.
Chapman, S. and Ferraro, V. C. A.: 1932, Terr. Magn. Atmos. Elec. 36, 147and 421.
Chapman, S. and Ferraro, V. C. A.: 1933, Terr. Magn. Atmos. Elec. 36, 79.
Cornwall, J. M., Coroniti, F. V., and Thorne, R. M.: 1970, J. Geophys. Res. 75, 4699.
Cornwall, J. M., Coroniti, F. V., and Thorne, R. M.: 1971, J. Geophys. Res. 76, 4428.
Dessler, A. J. and Parker, E. N.: 1959, J. Geophys. Res. 64, 2239.
Frank, L. A.: 1967a, J. Geophys. Res. 72, 1905.
Frank, L. A.: 1967b, J. Geophys. Res. 72, 3753.
Hoffman, R. A. and Bracken, P. A.: 1965, J. Geophys. Res. 70, 3541.
Hoffman, R. A. and Bracken, P. A.: 1967, J. Geophys. Res. 72, 6039.
Konradi, A., Semar, C. L., and Fritz, T. A.: 1975, J. Geophys. Res. 80, 543.
Lyons, L. R. and Williams, D. J.: 1976, J. Geophys. Res. 81, 216.
Lyons, L. R. and Williams, D. J.: 1980, J. Geophys. Res. 85, 523.
Mauk, B. H. and McIlwain, C. E.: 1974, J. Geophys. Res. 79, 3193.
McIlwain, C. E.: 1974, in B. M. McCormac (ed.), Magnetospheric Physics, D. Reidel Publ. Co., Dordrecht, Holland, p. 143.
Olbert, S., Siscoe, G. L., and Vasyliunas, V. M.: 1968, J. Geophys. Res. 73, 1115.
Parker, E. N.: 1957, Phys. Rev. 107, 924.
Sckopke, N.: 1966, J. Geophys. Res. 71, 3125.
Shelley, E. G., Sharp, R. D., and Johnson, R. G.: 1976, Geophys. Res. Letters 3, 654.
Singer, S. F.: 1957, Trans. Am. Geophys. Union 38, 175.
Smith, P. H. and Hoffman, R. A.: 1973, J. Geophys. Res. 78, 4731.
Smith, P. H., Bewtra, N. K., and Hoffman, R. A.: 1981, J. Geophys. Res. 86, 3470.
Stuart, G. W.: 1959, Phys. Rev. Letters 2, 417.
Wentworth, R. C., MacDonald, W. M., and Singer, S. F.: 1959, Bull. Am. Phys. Soc. Ser. 2, 4, 7.
Wentworth, R. C., MacDonald, W. M., and Singer, S. F.: 1959, Phys. Fluids 2, 499.
Williams, D. J.: 1980, in S. I. Akasofu (ed.), Dynamics of the Magnetosphere, D. Reidel Publ. Co., Dordrecht, Holland, p. 407.
Williams, D. J.: 1974, EOS 55, 1021.
Williams, D. J.: 1981a, J. Geophys. Res. 86, 189.
Williams, D. J.: 1981b, Planet. Space Sci. 29, 1195.
Williams, D. J. and Lyons, L. R.: 1974a, J. Geophys. Res. 79, 4195.
Williams, D. J. and Lyons, L. R.: 1974b, J. Geophys. Res. 79, 4791.
Williams, D. J., Hernandez, G., and Lyons, L. R.: 1976, J. Geophys. Res. 81, 608.
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Williams, D.J. The Earth's ring current: Causes, generation, and decay. Space Sci Rev 34, 223–234 (1983). https://doi.org/10.1007/BF00175279
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DOI: https://doi.org/10.1007/BF00175279