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Oscillations Above Sunspots

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Abstract

The 3-min oscillations in the sunspot atmosphere are discussed, based on joint observing with the Transition Region and Coronal Explorer – TRACE and the Solar and Heliospheric Observatory – SOHO. We find that the oscillation amplitude above the umbra increases with increasing temperature, reaches a maximum for emission lines formed close to 1–2× 105 K, and decreases for higher temperatures. Oscillations observed with a high signal-to-noise ratio show deviations from pure linear oscillations. The results do not support the sunspot filter theory, based on the idea of a chromospheric resonator. Whereas the filter theory predicts several resonant peaks in the power spectra, equally spaced ∼ 1 mHz in frequency, the observed power spectra show one dominating peak, close to 6 mHz. Spectral observations show that the transition region lines contribute less than 13 percent to the TRACE 171 Å channel intensity above the umbra. The 3-min oscillations fill the sunspot umbra in the transition region. In the corona the oscillations are concentrated to smaller regions that appear to coincide with the endpoints of sunspot coronal loops, suggesting that wave propagation along the magnetic field makes it possible for the oscillations to reach the corona.

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References

  • Allen, R., Landi, E., Landini, M., and Bromage, B.J.I.: 2000, Astron. Astrophys. 358, 332.

    Google Scholar 

  • Arnaud M.and Raymond, J.: 1992, Astrophys. J., 398, 394.

    Google Scholar 

  • Arnaud M.and Rothenflug, R.: 1985, Astron. Astrophys. Suppl. 60, 425.

    Google Scholar 

  • Aschwanden, M.J., Fletcher, L., Schrijver, C.J., and Alexander, D.: 1999, Astrophys. J. 520, 880.

    Google Scholar 

  • Bard, S.and Carlsson, M.: 1997, in A. Wilson (ed.), Fifth SOHO Workshop:The Corona and Solar Wind Near Minimum Activity, ES ASP-404, p. 189.

  • Berghmans, D. and Clette, F.: 1999, Solar Phys. 186, 207.

    Google Scholar 

  • Bogdan, T.J.: 2000, Solar Phys. 192, 373.

    Google Scholar 

  • Brynildsen, N., Leifsen, T., Kjeldseth-Moe, O., Maltby, P., and Wilhelm, K.: 1999a, Astrophys. J.

  • Brynildsen, N., Kjeldseth-Moe, O., Maltby, P., and Wilhelm, K.: 1999b, Astrophys. J. 517, L159.

    Google Scholar 

  • Brynildsen, N., Maltby, P., Leifsen, T., Kjeldseth-Moe, O., and Wilhelm, K.: 2000, Solar Phys. 191, 129.

    Google Scholar 

  • Brynildsen, N., Maltby, P., Fredvik, T., Kjeldseth-Moe, O., and Wilhelm, K.: 2001, Solar Phys. 198, 89.

    Google Scholar 

  • Carlsson, M.: 2001, in P. Murdin (ed.), Encyclopedia of Astronomy and Astrophysics , Institute of Physics Publishing, Bristol and Nature Publishing Group, London, p. 2485.

    Google Scholar 

  • Christopoulou, E.B., Georgakilas, A.A., and Koutchmy, S.: 2000, Astron. Astrophys. 354, 305.

    Google Scholar 

  • Delaboudinière, J.-P. et al.: 1995, Solar Phys. 162, 291.

    Google Scholar 

  • DeMoortel, I., Hood, A.W., and Ireland, J.: 2002, Astron. Astrophys. 381, 311.

    Google Scholar 

  • DeMoortel, I., Ireland, J., and Walsh, R.W.: 2000, Astron. Astrophys. 355, L23.

    Google Scholar 

  • Dere, K.P., Landi, E., Young, P.R., and Del Zanna, G.: 2001, Astrophys. J. Suppl. 134, 331.

    Google Scholar 

  • Domingo, V., Fleck, B., and Poland, A.I.: 1995, Solar Phys. 162, 1.

    Google Scholar 

  • Fludra, A.: 1999, Astron. Astrophys. 344, L75.

    Google Scholar 

  • Fludra, A.: 2001, Astron. Astrophys. 368, 639

    Google Scholar 

  • Fredvik, T.and Maltby, P.: 1998, Solar Phys. 184, 113.

    Google Scholar 

  • Freeland, S.L. and Bentley, R.D.: 2001, in P. Murdin (ed.), Encyclopedia of Astronomy and Astrophysics , Institute of Physics Publishing, Bristol and Nature Publishing Group, London, p. 2922.

    Google Scholar 

  • Gelfreikh, G.B., Grechnev, V., Kosugi, T., and Shibasaki, K.: 1999, Solar Phys. 185, 177.

    Google Scholar 

  • Giovanelli, R.G.: 1972, Solar Phys. 27, 71.

    Google Scholar 

  • Gopalswamy, N., Schmahl, E.J., and Kundu, M.R.: 1993, Bull. Am. Astron. Soc. 25, 1396.

    Google Scholar 

  • Gurman, J.B., Leibacher, J.W., Shine, R.A., Woodgate, B.E., and Henze, W.: 1982, Astrophys. J. 253, 939.

    Google Scholar 

  • Handy, B.N. et al.: 1999, Solar Phys. 187, 229.

    Google Scholar 

  • Harrison, R.A. et al.: 1995, Solar Phys. 162, 233.

    Google Scholar 

  • Jensen, E. and Orrall, F.Q.: 1963, Astrophys. J. 138, 252.

    Google Scholar 

  • Kendall, M., Stuart, K., and Ord, J.K.: 1983, The Advanced Theory of Statistics,Vol.3, 4th edition, Charles Griffin and Company, London & High Wycombe, p. 663.

    Google Scholar 

  • Landi, E., Del Zanna, G., Breeveld, E.R., Landini, M., Bromage, B.J.I., and Pike, C.D.: 1999, Astron. Astrophys. Suppl. 135, 171.

    Google Scholar 

  • Lites, B.W.: 1986, Astrophys. J. 301, 1005.

    Google Scholar 

  • Lites, B.W.: 1992, in J.H. Thomasand N.O. Weiss (eds.), Sunspots:Theory and Observations, Kluwer Academic Publishers, Dordrecht, Holland, p. 261.

    Google Scholar 

  • Lites, B.W., Thomas, J.H., Bogdan, T.J., and Cally, P.S.: 1998, Astrophys. J. 497, 464.

    Google Scholar 

  • Maltby, P., Brynildsen, N., Fredvik, T., Kjeldseth-Moe, O., and Wilhelm, K.: 1999, Solar Phys. 190, 437.

    Google Scholar 

  • Maltby, P., Brynildsen, N., Kjeldseth-Moe, O., and Wilhelm, K.: 2001, Astron. Astrophys. 373, L1.

    Google Scholar 

  • Moore, R.L.: 1981, in L.E. Cramand J.H. Thomas (eds.), The Physics of Sunspots , Sacramento Peak Obs. Conf., Sunspot, New Mexico, p. 259.

    Google Scholar 

  • Nakariakov, V.M., Verwichte, E., Berghmans, D., and Robbrecht, E.: 2000, Astron. Astrophys. 362, 1151.

    Google Scholar 

  • O'Shea, E., Banerjee, D., Doyle, J.G., Fleck, B., and Murtagh, F.: 2001, Astron. Astrophys. 368, 1095.

    Google Scholar 

  • Roberts, B.: 2000, Solar Phys. 193, 139.

    Google Scholar 

  • Sams, B.J., Golub, L., and Weiss, N.O.: 1992, Astrophys. J. 399, 313.

    Google Scholar 

  • Scherrer, P.H. et al.: 1995, Solar Phys. 162, 129.

    Google Scholar 

  • Schrijver, C.J. et al.: 1999, Solar Phys. 187, 261.

    Google Scholar 

  • Settele, A.: 2001, Magneto-Atmosphärische Wellen in der Umbra von Sonnenflecken, Thesis, Universität Potsdam.

  • Settele, A., Staude, J., and Zhugzhda, Y.D.: 2001, Solar Phys. 202, 281.

    Google Scholar 

  • Shibasaki, K.: 2001, Astrophys. J. 550, 1113.

    Google Scholar 

  • Shine, R.A.: 2000, Bull. Am. Astron. Soc. 32, 834.

    Google Scholar 

  • Spadaro, D.: 1999, in A.Wilson (ed.), Magnetic Fields and Solar Processes, ES ASP-448, p. 157.

  • Staude, J.: 1999, in B. Schmieder, A. Hofmann, and J. Staude (eds.), Third Advances in Solar Physics Euro conference:Magnetic Fields and Oscillations, ASP Conf. Ser. 184, p. 113.

  • Tziotziou, K., Tsiropoula, G., and Mein, P.: 2002, Astron. Astrophys. 381, 279.

    Google Scholar 

  • Wilhelm, K. et al.: 1995, Solar Phys. 162, 189.

    Google Scholar 

  • Yoon, T.-S., Yun, H.S., and Kim, J.-H.: 1995, Korean Astrophys. Soc. 28, 245.

    Google Scholar 

  • Zirin, H.and Stein, A.: 1972, Astrophys. J. 178, L85.

    Google Scholar 

  • Žugžda, Y.D., Locāns, V., and Staude, J.: 1983, Solar Phys. 82, 369.

    Google Scholar 

  • Žugžda, Y.D., Staude, J., and Locāns, V.: 1984, Solar Phys. 91, 219.

    Google Scholar 

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Authors and Affiliations

  1. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, 0315, Oslo, Norway

    N. Brynildsen, P. Maltby, T. Fredvik & O. Kjeldseth-Moe

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  1. N. Brynildsen
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  2. P. Maltby
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  3. T. Fredvik
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  4. O. Kjeldseth-Moe
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Brynildsen, N., Maltby, P., Fredvik, T. et al. Oscillations Above Sunspots. Solar Physics 207, 259–290 (2002). https://doi.org/10.1023/A:1016238317702

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