Abstract
On the basis of field and particle observations, it is suggested that a bright auroral display is a part of a magnetosphere-ionosphere current system which is fed by a charge-separation process in the outer magnetosphere (or the solar wind). The upward magnetic-field-aligned current is flowing out of the display, carried mainly by downflowing electrons from the hot-particle populations in the outer magnetosphere (the ambient cold electrons being depleted at high altitudes). As a result of the magnetic mirroring of these downflowing current carriers, a large potential drop is set up along the magnetic field, increasing both the number flux and the kinetic energy of precipitating electrons. It is found that this simple basic model, when combined with wave-particle interactions, may be able to explain a highly diversified selection of auroral particle observations. It may thus be possible to explain both ‘inverted-V’ events and auroral rays in terms of a static parallel electric field, and the electric field may be compatible with a strongly variable pitch-angle distribution of the precipitating electrons, including distributions peaked at 90° as well as 0°. This model may also provide a simple explanation of the simultaneous precipitation of electrons and collimated positive ions.
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References
Ackerson, K. L. and Frank, L. A.: 1972,J. Geophys. Res. 77, 1128.
Aggson, T. L.: 1969, in B. M. McCormac and A. Omholt (eds.),Atmospheric Emissions, Van Nostrand Reinhold Co., New York, p. 305.
Albert, R. D. and Lindstrom, P. J.: 1970,Science 170, 1398.
Alfvén, H.: 1968,Ann. Geophys. 24, 1, 341.
Alfvén, H.: 1975, in B. Hultqvist and L. Stenflo (eds.),Physics of the Hot Plasma in the Magnetosphere, 1975, Plenum Press, New York, pp. 1–22.
Alfvén, H. and Fälthammar, C.-G.: 1963,Cosmical Electrodynamics, Fundamental Principles, 2nd edn., Oxford University Press, London.
Armstrong, J. C. and Zmuda, A. J.: 1970,J. Geophys. Res. 75, 7122.
Armstrong, J. C., Akasofu, S.-I., and Rostoker, G.: 1975,J. Geophys. Res. 80, 575.
Arnoldy, R. L., Lewis, P. B., and Isaacson, P. O.: 1974,J. Geophys. Res. 79, 4208.
Aubry, M. P., Kivelson, M. G., McPehrron, R. L., Russell, C. T., and Colburn, D. S.: 1972,J. Geophys. Res. 77, 5487.
Berko, F. W., Hoffman, R. A., Burton, R. K., and Holzer, R. E.: 1975,J. Geophys. Res. 80, 37.
Biskamp, D. and Chodura, R.: 1973,Phys. Fluids 16, 888.
Block, L. P.: 1967,Space Sci. Rev. 7, 198.
Block, L. P.: 1972,Cosmic Electrodyn. 3, 349.
Block, L. P.: 1975, in B. Hultqvist and L. Stenflo (eds.),Physics of the Hot Plasma in the Magnetosphere, 1975, Plenum Press, New York, pp. 229–249.
Block, L. P. and Fälthammar, C.-G.: 1968,J. Geophys. Res. 73, 4807.
Block, L. P. and Fälthammar, C.-G.: 1976,Ann. Geophys. 32, 1926.
Bosqued, J. M., Cardona, G., and Réme, H.: 1974,J. Geophys. Res. 79, 98.
Boström, R.: 1964,J. Geophys. Res. 69, 4983.
Buneman, O.: 1959,Phys. Rev. 115, 503.
Burch, J. L., Fields, S. A., Hanson, W. B., Heelis, R. A., and Hoffman, R. A.: 1976,J. Geophys. Res. 81, 2223.
Cauffman, D. P. and Gurnett, D. A.: 1972,Space Sci. Rev. 13, 369.
Chamberlain, J. W.: 1961,Physics of the Aurora and Airglow, Academic Press, New York and London, p. 124.
Chappell, C. R.: 1972,Rev. Geophys. Space Phys. 10, 951.
Choy, L. W., Arnoldy, R. L., Potter, W., Kintner, P., and Cahill, Jr., L. J.: 1971,J. Geophys. Res. 76, 8279.
Cloutier, P. A., Sandel, B. R., Anderson, H. R., Pazich, P. M., and Spiger, R. J.: 1973,J. Geophys. Res. 78, 640.
Cummings, W. D., O'Sullivan, R. J., and Coleman, Jr., P. J. 1969,J. Geophys. Res. 74, 778.
Dunckel, N., Ficklin, B., Rorden, L., and Helliwell, R. A.: 1970,J. Geophys. Res. 75, 1854.
Evans, D. S.: 1974,J. Geophys. Res. 79, 2853.
Frank, L. A.: 1971,J. Geophys. Res. 76, 2265.
Frank, L. A. and Ackerson, K. L.: 1971,J. Geophys. Res. 76, 3612.
Frank, L. A. and Gurnett, D. A.: 1971,J. Geophys. Res. 76, 6829.
Gary, S. P., Montgomery, D., and Swift, D. W.: 1968,J. Geophys. Res. 73, 7524.
Gurnett, D. A.: 1974,J. Geophys. Res. 79, 4227.
Gurnett, D. A. and Akasofu, S.-I.: 1974,J. Geophys. Res. 79, 3197.
Gurnett, D. A. and Frank, L. A.: 1973,J. Geophys. Res. 78, 145.
Haerendel, G.: 1974,Trans. Amer. Geophys. Union 55, 1005.
Hagg, E. L.: 1967,Can. J. Phys. 45, 27.
Hallinan, T. J. and Davis, T. N.: 1970,Planetary Space Sci. 18, 1735.
Hanson, W. B., Zuccaro, D. R., Lippincott, C. R., and Sanatani, S.: 1973,Radio Sci. 8, 333.
Heikkila, W. J.: 1974,J. Geophys. Res. 79, 2496.
Helliwell, R. A.: 1967,J. Geophys. Res. 72, 4773.
Heppner, J. P.: 1972,Planetary Space Sci. 20, 1475.
Heppner, J. P.: 1973,Radio Sci. 8, 933.
Hess, W. N., Trichel, M. C., Davis, T. N., Beggs, W. C., Kraft, G. E., Stassinopoulos, E., and Maier, E. J. R.: 1971,J. Geophys. Res. 76, 6067.
Hoffman, R. A. and Evans, D. S.: 1968,J. Geophys. Res. 73, 6201.
Hultqvist, B.: 1971,Planetary Space Sci. 19, 749.
Jaggi, R. K. and Wolf, R. A.: 1973,J. Geophys. Res. 78, 2852.
Jeffries, R. A., Roach, W. H., Hones, Jr., E. W., Wescott, E. M., Stenbaek-Nielsen, H. C., Davis, T. N., and Winningham, J. D.: 1975,Geophys. Res. Letters 2, 285.
Jones, T. W. and Kellogg, P. J.: 1973,J. Geophys. Res. 78, 2166.
Kan, J. R.: 1975,J. Geophys. Res. 80, 2089.
Kennel, C. F. and Petschek, H. E.: 1966,J. Geophys. Res. 71, 1.
Kindel, J. M. and Kennel, C. F.: 1971,J. Geophys. Res. 76, 3055.
Knight, S.: 1973,Planetary Space Sci. 21, 741.
Kurth, W. S., Baumback, M. M., and Gurnett, D. A.: 1975,J. Geophys. Res. 80, 2764.
Laval, G. and Pellat, R.: 1970,J. Geophys. Res. 75, 3255.
Lemaire, J. and Scherer, M.: 1973a,Planetary Space Sci. 21, 281.
Lemaire, J. and Scherer, M.: 1973b,Rev. Geophys. Space Phys. 11, 427.
Lemaire, J. and Scherer, M.: 1974,Planetary Space Sci. 22, 1485.
Lennartsson, W.: 1973a, techn. rep. TRITA-EPP-73-11, Department of Plasma Physics, Royal Institute of Technology, S-100 44 Stockholm. Revised version inPlanetary Space Sci. 25 (1977), 89.
Lennartsson, W.: 1973b,Planetary Space Sci. 21, 2089.
McIlwain, C. E.: 1975, in B. Hultqvist and L. Stenflo (eds.),Physics of the Hot Plasma in the Magnetosphere, 1975, Plenum Press, New York, pp. 91–112.
O'Brien, B. J.: 1970,Planetary Space Sci. 18, 1821.
O'Brien, B. J. and Reasoner, D. L.: 1971,J. Geophys. Res. 76, 8258.
Park, R. J. and Cloutier, P. A.: 1971,J. Geophys. Res. 76, 7714.
Perkins, F. W.: 1968,J. Geophys. Res. 73, 6631.
Persson, H.: 1963,Phys. Fluids 6, 1756.
Persson, H.: 1966,Phys. Fluids 9, 1090.
Potter, W. E.: 1970,J. Geophys. Res. 75, 5415.
Reasoner, D. L. and Chappell, C. R.: 1973,J. Geophys. Res. 78, 2176.
Rosenberg, T. J., Helliwell, R. A., and Katsufrakis, J. P.: 1971,J. Geophys. Res. 76, 8445.
Sharber, J. R. and Heikkila, W. J.: 1972,J. Geophys. Res. 77, 3397.
Shelley, E. G., Johnson, R. G., and Sharp, R. D.: 1972,J. Geophys. Res. 77, 6104.
Stix, T. H.: 1962,The Theory of Plasma Waves, McGraw-Hill, New York.
Swift, D. W.: 1965,J. Geophys. Res. 70, 3061.
Swift, D. W.: 1970,J. Geophys. Res. 75, 6324.
Swift, D. W.: 1975,J. Geophys. Res. 80, 2096.
Vasyliunas, V. M.: 1970, in G. Sklovi (ed.),The Polar Ionosphere and Magnetospheric Processes, Gordon and Breach, New York.
Vankatarangan, P., Burrows, J. R., and McDiarmid, I. B.: 1975,J. Geophys. Res. 80, 66.
Wescott, E. M., Stolarik, J. D., and Heppner, J. P.: 1969,J. Geophys. Res. 74, 3469.
Wescott, E. M., Stenbaek-Nielsen, H. C., Hallinan, T. J., Davis, T. N., and Peek, H. M.: 1976,J. Geophys. Res. 81, 4495.
Westerlund, L. H.: 1969,J. Geophys. Res. 74, 351.
Whalen, B. A. and McDiarmid, I. B.: 1972,J. Geophys. Res. 77, 191.
Whipple, Jr., E. C.: 1976,Phys. Dept., Univ. of Calif., San Diego, La Jolla, Ca. 92093, preprint,J. Geophys. Res. (1977), in press.
Zmuda, A. J. and Armstrong, J. C.: 1974,J. Geophys. Res. 79, 2501.
Zmuda, A. J., Armstrong, J. C., and Heuring, F. T.: 1970,J. Geophys. Res. 75, 4757.
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Lennartsson, W. On the role of magnetic mirroring in the auroral phenomena. Astrophys Space Sci 51, 461–495 (1977). https://doi.org/10.1007/BF00644166
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DOI: https://doi.org/10.1007/BF00644166