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Solar Physics

, Volume 209, Issue 2, pp 265–286 | Cite as

Spectroscopic Observation of Coronal Waves

  • T. Sakurai
  • K. Ichimoto
  • K.P. Raju
  • J. Singh
Article

Abstract

A time sequence over 80 min of coronal green-line spectra was obtained with a corona- graph at the Norikura Solar Observatory. Doppler velocities, line intensities, and line widths were derived through fitting a single Gaussian to the observed line profiles. Coronal waves have been clearly detected in the Doppler velocity data. The Fourier analysis shows powers in a 1–3 mHz range, and in higher frequencies (5–7 mHz) at localized regions. The propagation speed of the waves was estimated by correlation analysis. The line intensity and line width did not show clear oscillations, but their phase relationship with the Doppler velocity indicates propagating waves rather than standing waves. The existence of Alfvén waves whose speed is 500 km s−1 or faster is possible but inconclusive, while the existence of slower waves (of the order of 100 km s−1, possibly sound waves) is evident. The energy carried by the detected sound waves is far smaller than the required heat input rate to the quiet corona.

Keywords

Line Width Heat Input Standing Wave Slow Wave Sound Wave 
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.

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References

  1. Antonucci, E., Gabriel, A. H., and Patchett, B. E.: 1984, Solar Phys. 93, 85.ADSGoogle Scholar
  2. Aschwanden, M. J., Fletcher, L., Schrijver, C. J., and Alexander, D.: 1999, Astrophys. J. 520, 880.ADSCrossRefGoogle Scholar
  3. Billings, D. E.: 1959, Astrophys. J. 130, 215.ADSCrossRefGoogle Scholar
  4. Brynildsen, N., Kjeldseth-Moe, K., Maltby, P., and Wilhelm, K.: 1999, Astrophys. J. Lett. 517, L159.ADSCrossRefGoogle Scholar
  5. Chapman, R. D., Jordan, S. D., Neupert, W. M., and Thomas, R. J.: 1972, Astrophys. J. Lett. 174, L97.ADSCrossRefGoogle Scholar
  6. DeForest, C. E. and Gurman, J. B.: 1998, Astrophys. J. Lett. 501, L217.ADSCrossRefGoogle Scholar
  7. Dermendjiev, V. N.: 1991, in P. Ulmschneider, E. R. Priest, and R. Rosner (eds.), Mechanisms of Chromospheric and Coronal Heating, Springer Verlag, Berlin, p. 33.CrossRefGoogle Scholar
  8. Dixon, W. J. and Massey, F. J., Jr.: 1951, Introduction to Statistical Analysis, McGraw Hill, New York, p. 164.zbMATHGoogle Scholar
  9. Domingo, V., Fleck, B., and Poland, A. I.: 1995, Solar Phys. 162, 1.ADSCrossRefGoogle Scholar
  10. Egan, T. F. and Schneeberger, T. J.: 1979, Solar Phys. 64, 223.ADSCrossRefGoogle Scholar
  11. Fludra, A.: 1999, Astron. Astrophys. 344, L75.ADSGoogle Scholar
  12. Hansteen, V. and Maltby, P.: 1992, Comments Astrophys. 16, 137.ADSGoogle Scholar
  13. Hara, H. and Ichimoto, K.: 1999, Astrophys. J. 513, 969.ADSCrossRefGoogle Scholar
  14. Ichimoto, K., Hara, H., Takeda, A., Kumagai, K., Sakurai, T., Shimizu, T., and Hudson, H. S.: 1995, Astrophys. J. 445, 978.ADSCrossRefGoogle Scholar
  15. Ichimoto, K., Noguchi, M., Tanaka, N., Kumagai, K., Shinoda, K., Nishino, T., Fukuda, T., Sakurai, T., and Takeyama, N.: 1999, Publ. Astron. Soc. Japan 51, 383.ADSCrossRefGoogle Scholar
  16. Koutchmy, S., Zhugzda, Y. D., and Locans, V.: 1983, Astron. Astrophys. 120, 185.ADSGoogle Scholar
  17. Noxon, J. F.: 1966, Astrophys. J. 145, 400.ADSCrossRefGoogle Scholar
  18. Ofman, L., Nakariakov, V. M., and DeForest, C. E.: 1999, Astrophys. J. 514, 441.ADSCrossRefGoogle Scholar
  19. Ofman, L., Romoli, M., Poletto, G., Noci, G., and Kohl, J. L.: 1997, Astrophys. J. 491, L111.ADSCrossRefGoogle Scholar
  20. Pasachoff, J. M. and Ladd, E. F.: 1987, Solar Phys. 109, 365.ADSCrossRefGoogle Scholar
  21. Pasachoff, J. M. and Landman, D. A.: 1984, Solar Phys. 90, 325.ADSCrossRefGoogle Scholar
  22. Percival, D. B. and Walden, A. T.: 1993, Spectral Analysis for Physical Applications, Cambridge University Press, Cambridge, pp. 489-496.CrossRefzbMATHGoogle Scholar
  23. Roberts, B.: 2000, Solar Phys. 193, 139.ADSCrossRefGoogle Scholar
  24. Rušin, V. and Minarovjech, M.: 1991, in P. Ulmschneider, E. R. Priest, and R. Rosner (eds.), Mechanisms of Chromospheric and Coronal Heating, Springer Verlag, Berlin, p. 30.Google Scholar
  25. Sakurai, T., Ichimoto, K., Raju, K. P., and Singh, J.: 2002, in P. C. H. Martens and D. Cauffman (eds.), Multi-Wavelength Observations of Coronal Structure and Dynamics, Elsevier Science, New York, in press.Google Scholar
  26. Schrijver, C. J., Title, A. M., Berger, T. E., Fletcher, L., Hurlburt, N. E., Nightingale, R. W., Shine, R. A., Tarbell, T. D., Wolfson, J., Golub, L., Bookbinder, J. A., DeLuca, E. E., McMillen, R. A., Warren, H. P., Kankelborg, C. C., Handy, B. N., and De Pontieu, B.: 1999, Solar Phys. 187, 261.ADSCrossRefGoogle Scholar
  27. Singh, J., Cowsik, R., Raveendran, A. V., Bagare, S., Saxena, A. K., Sundararaman, K., Krishan, V., Naidu, N., Samson, J. P. A., and Gabriel, F.: 1997, Solar Phys. 170, 235.ADSCrossRefGoogle Scholar
  28. Singh, J., Ichimoto, K., Imai, H., Sakurai, T., and Takeda, A.: 1999, Publ. Astron. Soc. Japan 51, 269.ADSCrossRefGoogle Scholar
  29. Tsubaki, T.: 1977, Solar Phys. 51, 121.ADSCrossRefGoogle Scholar
  30. Tsubaki, T., Saito, Y., Suematsu, Y., and Nakagomi, Y.: 1986, Publ. Astron. Soc. Japan 38, 251.ADSGoogle Scholar
  31. Withbroe, G. L. and Noyes, R. W.: 1977, Ann. Rev. Astron. Astrophys. 15, 363.ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • T. Sakurai
    • 1
  • K. Ichimoto
    • 1
  • K.P. Raju
    • 2
  • J. Singh
    • 2
  1. 1.National Astronomical ObservatoryMitaka, TokyoJapan
  2. 2.Indian Institute of AstrophysicsKoramangala, BangaloreIndia

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