Advertisement

Astrophysics and Space Science

, Volume 152, Issue 2, pp 287–311 | Cite as

Soliton and strong Langmuir turbulence in solar flare processes

  • M. T. Song
  • S. T. Wu
  • M. Dryer
Article
  • 44 Downloads

Abstract

The occurrence of modulational instability in the current sheet is investigated. Particular attention is drawn to the plasma micro-instability in this current sheet (i.e., the diffusion region) and its relation to the flare process. It is found that the solitons or strong Langmuir turbulence is likely to occur in the diffusion region under solar flare conditions in which the electric resistivity could be greatly enhanced by several orders of magnitude in this diffusion region. The result is a significant heating and stochastic acceleration of particles. Physically, the occurrence of soliton and strong Langmuir turbulence can be identified with a sudden eruption of an electric current leading to a local vacuum in which an electric potential is formed and results in the release of a huge amount of free energy. A numerical example is used to demonstrate the transition of the magnetic field, velocity, and plasma density from the outer MHD region into the diffusive (resistive) region and, then, back out again with the completion of the energy conversion process. This is all made possible by an increase of resistivity by 4–5 orders of magnitude over the classical value.

Keywords

Free Energy Soliton Flare Electric Potential Plasma Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Alfvén, H. and Carlquist, P.: 1967,Solar Phys. 1, 220.Google Scholar
  2. Boyd, T. J. M. and Sanderson, J. J.: 1969,Plasma Dynamics, Nelson, London.Google Scholar
  3. Coppi, B. and Friedland, A. B.: 1971,Astrophys. J. 169, 379.Google Scholar
  4. DegTyarev, L. M., Zakharov, V. E., and Rudakov, L. I.: 1975,Soviet Phys. JETP 41, 57.Google Scholar
  5. Dungey, J. W.: 1953,Phil. Mag. 44, 725.Google Scholar
  6. Friedman, E. and Hamberger, S. M.: 1968,Astrophys. J. 152, 667.Google Scholar
  7. Friedman, E. and Hamberger, S. M.: 1969,Astrophys. J. 8, 104; 398.Google Scholar
  8. Furth, H. P., Killeen, J., and Rosenbluth, M. N.: 1963,Phys. Fluids 6, 459.Google Scholar
  9. Hasegawa, A.: 1975,Plasma Instabilities and Nonlinear Effects, Interscience Publ., Inc., New York.Google Scholar
  10. Heyvaerts, J., Priest, E. R., and Rust, D. M.: 1977,Astrophys. J. 216, 123.Google Scholar
  11. Hood, A. W. and Priest, E. R.: 1979,Solar Phys. 64, 303.Google Scholar
  12. Li Xiao Qing: 1985,Astrophys. Space Sci. 112, 13.Google Scholar
  13. Parker, E. N.: 1963,Astrophys. J. Suppl. Ser.,8, 177.Google Scholar
  14. Parker, E. N.: 1979,Cosmical Magnetic Fields, Clarendon Press, Oxford.Google Scholar
  15. Petschek, H. E. 1964, in W. N. Hess (eds.),The Physics of Solar Flares, NASA SP-50, p. 425.Google Scholar
  16. Priest, E. R.: 1983, ‘Unstable Current Systems and Plasma Instabilities in Astrophysics’, in M. Kundu and G. D. Holman (eds.),IAU Symp. 107, 233.Google Scholar
  17. Rudakov, L. I. and Tsytovich, V. N.: 1978,Phys. Rep. 40C, No. 1, 3.Google Scholar
  18. Sonnerup, B. U. O.: 1973,High Energy Phenomena on the Sun, Proceedings of a Symp. held at NASA Goddard Flight Center, p. 357.Google Scholar
  19. Sonnerup, B. U. O.: 1983, ‘Unstable Current Systems and Plasma Instabilities in Astrophysics’, in M. Kundu and G. D. Holman (eds.),IAU Symp. 107, 5.Google Scholar
  20. Spicer, D. S.: 1977,Solar Phys. 53, 305.Google Scholar
  21. Sturrock, P. A.: 1975, ‘Coronal Disturbances’, in G. Newkirk (ed.),IAU Symp. 57, 437.Google Scholar
  22. Syrovatskii, S. I.: 1966,Soviet Astron. 10, 270.Google Scholar
  23. Syrovatskii, S. I.: 1978,Solar Phys. 58, 89.Google Scholar
  24. Tsytovich, V. N.: 1970,Nonlinear Effects in Plasma, Plenum Press, New York.Google Scholar
  25. Ugai, M. and Tsuda, T.: 1977,J. Plasma Phys. 17, 337.Google Scholar
  26. Van Hoven et al.: 1980, ‘The Preflare State’, in P. A. Sturrock (ed.),Solar Flares, Skylab Solar Workshop II, Colorado Univ. Press, Boulder, p. 17.Google Scholar
  27. Vasyliunas, V. M.: 1975,Rev. Geophys. Space Phys. 13, No. 1, 303.Google Scholar
  28. Vedenov, A. A. and Rudakov, L. I.: 1965,Soviet Phys. Dokl. 9, 1073.Google Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • M. T. Song
    • 1
  • S. T. Wu
    • 1
  • M. Dryer
    • 2
  1. 1.Center for Space Plasma and Aeronomic ResearchThe University of Alabama at HuntsvilleHuntsvilleUSA
  2. 2.Space Environment Lab/ERL/NOAABoulderUSA

Personalised recommendations