Solar Physics

, Volume 113, Issue 1–2, pp 107–120 | Cite as

Plasma dynamics at the very initial phases of flares

  • T. Watanabe


Plasma motions at the initial phases of flares observed in the high resolution soft X-ray spectrometers are summarized. Blue-shifted components of highly ionized metal ions suggest a senario of chromospheric evaporation. A large line width before and during hard X-ray bursts results from a superposition of multiple directed plasma motions or a turbulent motion directly connected to the magnetic reconnection. A further study with an increased sensitivity of the detector should be necessary in the next solar activity maximum.


Flare Initial Phase Solar Activity Line Width Activity Maximum 


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  1. Acton, L. W., Canfield, R. C., Gunkler, T. A., Hudson, H. S., Kiplinger, A. L., Leibacher, J. W.: 1982, Astrophys. J. 263, 409.ADSCrossRefGoogle Scholar
  2. Akita, K.: 1985, Ph. D. Thesis, University of Tokyo.Google Scholar
  3. Antonucci, E., Dennis, B. R., Gabriel, A. H., Simnett, G. M.: 1985, Solar Phys. 96, 129.ADSCrossRefGoogle Scholar
  4. Antonucci, E., Dodero, M. A.: 1986, Proc. the Lower Atmosphere of Solar Flares, ed. Neidig, D. F., p.363.Google Scholar
  5. Antonucci, E., Gabriel, A. H., Acton, L. W., Culhane, J. L., Doyle, J. G., Leibacher, J. W., Machado, M. E., Orwig, L. E., Rapley, C. G.: 1982, Solar Phys. 78, 107.ADSCrossRefGoogle Scholar
  6. Antonucci, E. Gabriel, A. H., Dennis, B. R.: 1984, Astrophys. J. 287, 917.ADSCrossRefGoogle Scholar
  7. Antonucci, E., Rosner, R., Tsinganos, K.: 1986, Astrophys. J. 301, 975.ADSCrossRefGoogle Scholar
  8. Canfield, R. C., Gunkler, T. A.: 1985, Astrophys. J. 288, 353.ADSCrossRefGoogle Scholar
  9. Canfield, R. C., Gunkler, T. A., Ricchiazzi, P. J.: 1984, Astrophys. J. 282, 292.ADSCrossRefGoogle Scholar
  10. Cheng, C.-C., Karpen, J. T., Doschek, G. A.: 1984, Astrophys. J. 286, 787.ADSCrossRefGoogle Scholar
  11. Cheng, C.-C., Oran, E. S., Doschek, G. A., Boris, J. P., Mariska, J. T.: 1983, Astrophys. J. 265, 1090.ADSCrossRefGoogle Scholar
  12. Culhane, J. L. et al.: 1981, Astrophys. J. Letters 244, L141.ADSCrossRefGoogle Scholar
  13. Doschek, G. A.: 1983, Solar Phys. 86, 9.ADSCrossRefGoogle Scholar
  14. Doschek, G. A. et al.: 1986, Chromospheric Explosions, Proc. SMM Workshop; Energetic Phenomena on the Sun, NASA CP 2439.Google Scholar
  15. Doyle, J. G., Bentley, R. D.: 1986, Astron. Astrophys. 155, 278.ADSGoogle Scholar
  16. Fisher, G. H., Canfield, R. C., McClymont, A. N.: 1984, Astrophys. J. Letters 281, L79.ADSCrossRefGoogle Scholar
  17. Gunkler, T. A., Canfield, R. C., Acton, L. W., Kiplinger, A. L.: 1984, Astrophys. J. 285, 835.ADSCrossRefGoogle Scholar
  18. Hiei, E., Widing, K. G.: 1979, Solar Phys. 61, 407.ADSCrossRefGoogle Scholar
  19. Ichimoto, K., Kurokawa, K.: 1984, Solar Phys. 93, 105.ADSGoogle Scholar
  20. Karpen, J. T., Doschek, G. A., Seely, J. F.: 1986, Astrophys. J. 306, 327.ADSCrossRefGoogle Scholar
  21. MacNeice, P., McWhirter, R. W. P., Spicer, D. S., Burgess, A.: 1984, Solar Phys. 90, 357.ADSCrossRefGoogle Scholar
  22. Nagai, F.: 1980, Solar Phys. 68, 351.ADSCrossRefGoogle Scholar
  23. Ogawara, Y.: 1987, in this proceeding.Google Scholar
  24. Pallavicini, R., Peres, G., Serio, S., Vaiana, G., Acton, L. W., Leibacher, J., Rosner, R.: 1983, Astrophys. J. 270, 270.ADSCrossRefGoogle Scholar
  25. Tanaka, K.: 1980, Proc. Japan-France Seminar on Solar Physics, ed. Moriyama, F., Henoux, J.-C., p.219.Google Scholar
  26. Tanaka, K., Watanabe, T., Nishi, K., Akita, K.: 1982, Astrophys. J. Letters 254, L59.ADSCrossRefGoogle Scholar
  27. Tanaka, K.: 1986, Publ. Astron. Soc. Japan 38, 225.ADSGoogle Scholar
  28. Tanaka, K.: 1987, Publ. Astron. Soc. Japan 39, 1.ADSGoogle Scholar
  29. Tanaka, K., Zirin, H.: 1985, Astrophys. J. 299, 1036.ADSCrossRefGoogle Scholar
  30. Watanabe, T., Tanaka, K., Akita, K., Nitta, N.: Solar Phys. 86, 107.Google Scholar
  31. Woodgate, B. E., Shine, R. A., Poland, A. I., Orwig, L. E.: 1983, Astrophys. J. 265, 530.ADSCrossRefGoogle Scholar

Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  • T. Watanabe
    • 1
  1. 1.Tokyo Astronomical ObservatoryTokyoJapan

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