Solar Physics

, Volume 246, Issue 1, pp 41–52

Direct Propagation of Photospheric Acoustic p Modes into Nonmagnetic Solar Atmosphere

Article

Abstract

Solar p modes are one of the dominant types of coherent signals in Doppler velocity in the solar photosphere, with periods showing a power peak at five minutes. The propagation (or leakage) of these p-mode signals into the higher solar atmosphere is one of the key drivers of oscillatory motions in the higher solar chromosphere and corona. This paper examines numerically the direct propagation of acoustic waves driven harmonically at the photosphere, into the nonmagnetic solar atmosphere. Erdélyi et al. (Astron. Astrophys.467, 1299, 2007) investigated the acoustic response to a single point-source driver. In the follow-up work here we generalise this previous study to more structured, coherent, photospheric drivers mimicking solar global oscillations. When our atmosphere is driven with a pair of point drivers separated in space, reflection at the transition region causes cavity oscillations in the lower chromosphere, and amplification and cavity resonance of waves at the transition region generate strong surface oscillations. When driven with a widely horizontally coherent velocity signal, cavity modes are caused in the chromosphere, surface waves occur at the transition region, and fine structures are generated extending from a dynamic transition region into the lower corona, even in the absence of a magnetic field.

Keywords

Hydrodynamics Methods: numerical Sun: chromosphere Sun: oscillations Sun: atmosphere Sun: transition region 

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References

  1. Ayres, T.R.: 1998, In: Deubner, F.L., Christensen-Dalsgaard, J., Kurtz, D. (eds.) New Eyes to See inside the Sun and Stars, IAU Symp. 185, Kluwer, Dordrecht, 403 – 414. Google Scholar
  2. Ayres, T.R.: 2002, Astrophys. J. 575, 1104 – 1115. CrossRefADSGoogle Scholar
  3. Carlsson, M., Stein, R.F.: 1995, Astrophys. J. 440, L29 – L32. CrossRefADSGoogle Scholar
  4. De Pontieu, B.: 1996, Ph.D. thesis, Max-Planck-Institute for Extraterrestrial Physics, Lindau, Germany. Google Scholar
  5. De Pontieu, B., Erdélyi, R.: 2006, Roy. Soc. Lond. Phil. Trans. Ser. A 364, 383 – 394. CrossRefADSGoogle Scholar
  6. De Pontieu, B., Erdélyi, R., de Wijn, A.G.: 2003, Astrophys. J. 595, L63 – L66. CrossRefADSGoogle Scholar
  7. De Pontieu, B., Erdélyi, R., James, S.P.: 2004, Nature 430, 536 – 539. CrossRefADSGoogle Scholar
  8. De Pontieu, B., Erdélyi, R., De Moortel, I.: 2005, Astrophys. J. 624, L61 – L64. CrossRefADSGoogle Scholar
  9. Erdélyi, R.: 2006, Roy. Soc. Lond. Phil. Trans. Ser. A 364, 351 – 381. CrossRefADSGoogle Scholar
  10. Erdélyi, R., Malins, C., Tóth, G., De Pontieu, B.: 2007, Astron. Astrophys. 467, 1299 – 1311. CrossRefADSGoogle Scholar
  11. Fleck, B., Schmitz, F.: 1991, Astron. Astrophys. 250, 235 – 244. ADSGoogle Scholar
  12. Gough, D., Toomre, J.: 1991, Annu. Rev. Astron. Astrophys. 29, 627 – 685. CrossRefADSGoogle Scholar
  13. James, S.: 2004, Ph.D. thesis, University of Sheffield. Google Scholar
  14. Kalkofen, W.: 2001, Astrophys. J. 557, 376 – 383. CrossRefADSGoogle Scholar
  15. Kalkofen, W., Rossi, P., Bodo, G., Massaglia, S.: 1994, Astron. Astrophys. 284, 976 – 984. ADSGoogle Scholar
  16. Kalkofen, W., Ulmschneider, P., Avrett, E.H.: 1999, Astrophys. J. 521, L141 – L144. CrossRefADSGoogle Scholar
  17. Lamb, H.: 1932, Hydrodynamics, Dover, New York. Google Scholar
  18. Leibacher, J., Gouttebroze, P., Stein, R.F.: 1982, Astrophys. J. 258, 393 – 403. CrossRefADSGoogle Scholar
  19. Leighton, R.B.: 1960, In: Thomas, R.N. (ed.) Aerodynamic Phenomena inStellar Atmospheres, IAU Symp. 12, Kluwer Academic, Dordrecht, 321 – 325. Google Scholar
  20. McWhirter, R.W.P., Thonemann, P.C., Wilson, R.: 1975, Astron. Astrophys. 40, 63 – 73. ADSGoogle Scholar
  21. McWhirter, R.W.P., Thonemann, P.C., Wilson, R.: 1977, Astron. Astrophys. 61, 859 – 861. ADSGoogle Scholar
  22. Rae, I.C., Roberts, B.: 1982, Astrophys. J. 256, 761 – 767. CrossRefADSGoogle Scholar
  23. Roberts, B.: 2004, In: Erdélyi, R., Ballester, J., Fleck, B. (eds.) SOHO 13 Waves, Oscillations and Small-Scale Transients Events in the Solar Atmosphere: Joint View from SOHO and TRACE P-547, ESA, Noordwijk, 1 – 15. Google Scholar
  24. Sutmann, G., Musielak, Z.E., Ulmschneider, P.: 1998, Astron. Astrophys. 340, 556 – 568. ADSGoogle Scholar
  25. Tóth, G.: 1996, Astrophys. Lett. Commun. 34, 245 – 246. ADSGoogle Scholar
  26. Ulrich, R.K.: 1970, Astrophys. J. 162, 993 – 1002. CrossRefADSGoogle Scholar
  27. Vernazza, J.E., Avrett, E.H., Loeser, R.: 1981, Astrophys. J. Suppl. 45, 635 – 725. CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Solar Physics and Space Plasma Research Centre (SP²RC), Department of Applied MathematicsUniversity of SheffieldSheffieldUK

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