Geomagnetism and Aeronomy

, Volume 58, Issue 1, pp 16–27 | Cite as

Parallel Electric Field and Electron Acceleration: an Advanced Model

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Abstract

A kinetic theory is necessary to explain the electron flows forming strong field-aligned currents in the auroral region. Its construction in this paper is based on the following propositions. (a) In the equatorial region, the arrival of electrons through the lateral surface of the magnetic flux tube is compensated for by their escape along the magnetic field. This is provided by action of the pitch-angle diffusion mechanism in the presence of plasma turbulence concentrated in this region. (b) Outside the equatorial region, the distribution functions of trapped and precipitating particles become “frozen.” The distributions and particle concentrations are calculated there in a model with conservation of the total energy and the magnetic moment. (c) The quasi-neutrality condition yields a large-scale parallel electric field, which contributes to the conserved total energy. In this field, the electron acceleration occurs, causing strong field-aligned currents directed upward from the ionosphere.

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References

  1. Antonova, E.E. and Tverskoi, B.A., The nature of the precipitation band of inverted-V type electrons and Harang discontinuity in the evening sector of the auroral ionosphere, Geomagn. Aeron., 1975, vol. 15, no. 1, pp. 105–111.Google Scholar
  2. Boström, R., Kinetic and space charge control of current flow and voltage drops along magnetic flux tubes: Kinetic effects, J. Geophys. Res., 2003, vol. 108, no. A4, 8004. doi 10.1029/2002JA009295CrossRefGoogle Scholar
  3. Boström, R., Kinetic and space charge control of current flow and voltage drops along magnetic flux tubes: 2. Space charge effects, J. Geophys. Res., 2004, vol. 109, A01208. doi 10.1029/2003JA010078CrossRefGoogle Scholar
  4. Ergun, R.E., Carlson, C.W., McFadden, J.P., Mozer, E.S., and Strangeway, R.J., Parallel electric fields in discrete arcs, Geophys. Res. Lett., 2000, vol. 27, pp. 4053–4056.CrossRefGoogle Scholar
  5. Fizika verkhnei atmosfery Zemli (Physics of the Earth’s Upper Atmosphere), Ivanov-Kholodnyi, G.S., Ed., Leningrad: Gidrometizdat, 1971.Google Scholar
  6. Fridman, S.V., Dynamics of the generation of magneticfield-aligned electric fields by drift currents, J. Geophys. Res., 1994, vol. 99, no. 5, pp. 8615–8634.CrossRefGoogle Scholar
  7. Knight, S., Parallel electric fields, Planet. Space Sci., 1973, vol. 21, no. 5, pp. 741–750.CrossRefGoogle Scholar
  8. Kropotkin A.P., The role of cold ionospheric plasma in the formation of the longitudinal electrostatic field on the auroral line of force, Geomagn. Aeron., 1985, vol. 25, pp. 966–970.Google Scholar
  9. Kropotkin, A.P., A longitudinal electrical field on auroral fieldlines in the magnetosphere, Geomagn. Aeron., 1986, vol. 26, pp. 119–122.Google Scholar
  10. Kropotkin, A.P. and Mart’yanov, S.A., Electric field caused by longitudinal flux of auroral electrons at an adiabatic motion of hot magnetospheric particles, Geomagn. Aeron., 1985, vol. 25, pp. 259–262.Google Scholar
  11. Kropotkin, A. P. and Mart’yanov, S.A., Nonstationary large-scale structure of ionospheric plasma in the region of longitudinal current running out Geomagn. Aeron., 1989, vol. 29, pp. 930–936.Google Scholar
  12. Lyons, L.R., Evans, D.S., and Lundin, R.J., An observed relation between magnetic field-aligned electric fields and downward electron energy fluxes in the vicinity of auroral forms, J. Geophys. Res., 1979, vol. 84, no. 2, pp. 457–461.CrossRefGoogle Scholar
  13. Mart’yanov, S.A., Features of hot magnetospheric particles fluxes related to their adiabatic motion, Geomagn. Aeron., 1982, vol. 22, pp. 686–690.Google Scholar
  14. Mozer, F.S., Bale, S.D., Bonnell, J.W., Chaston, C.C., Roth, I., and Wygant, J., Megavolt parallel potentials arising from double-layer streams in the Earth’s outer radiation belt, Phys. Rev. Lett., 2013, vol. 111, 235002.CrossRefGoogle Scholar
  15. Schriver, D., Particle simulation of the auroral zone showing parallel electric fields, waves, and plasma acceleration, J. Geophys. Res., 1999, vol. 104, A14655.CrossRefGoogle Scholar
  16. Stark, C.R., Cran-McGreehin, A.P., and Wright, A.N., Contributions to the magnetospheric parallel electric field, J. Geophys. Res., 2011, vol. 116, A07216. doi 10.1029/2010JA016270Google Scholar
  17. Trakhtengerts, V.Y. and Feldstein, A.Y., Turbulent Alfvén boundary layer in the polar ionosphere, I. Excitation conditions and energetics, J. Geophys. Res., 1991, vol. 96, no. 11, pp. 19363–19374.CrossRefGoogle Scholar
  18. Trakhtengerts, V.Y. and Demekhov, A.G., Discussion paper: Partial ring current and polarization jet, Int. J. Geomagn. Aeron., 2005, vol. 5, no. 3, GI3007. doi 10.1029/2004GI000091Google Scholar
  19. Trakhtengerts, V.Yu., Demekhov, A.G., Grafe, A., Fieldaligned currents in the magnetosphere caused by precipitations of energetic particles, Geomagn. Aeron. (Engl. Transl.), 1997, vol. 37, no. 4, pp. 9–16.Google Scholar
  20. Tverskoi, B.A., On longitudinal currents in the magnetosphere, Geomagn. Aeron., 1982, vol. 22, no. 6, pp. 991–995.Google Scholar
  21. Vasiliunas, V.M., Mathematical models of magnetospheric convection and its coupling to the ionosphere, in Particles and Fields in the Magnetosphere, McCormack, B.C., Ed., Higham, Mass.: Holland, 1970, pp. 60–71.CrossRefGoogle Scholar

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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Skobeltsyn Institute of Nuclear PhysicsLomonosov Moscow State UniversityMoscowRussia

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