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Observational Signatures of Waves and Flows in the Solar Corona

Abstract

Propagating perturbations have been observed in extended coronal loop structures for a number of years, but the interpretation in terms of slow (propagating) magneto-acoustic waves and/or as quasi-periodic upflows remains unresolved. We used forward-modelling to construct observational signatures associated with a simple slow magneto-acoustic wave or periodic flow model. Observational signatures were computed for the 171 Å Fe ix and the 193 Å Fe xii spectral lines. Although there are many differences between the flow and wave models, we did not find any clear, robust observational characteristics that can be used in isolation (i.e. that do not rely on a comparison between the models). For the waves model, a relatively rapid change of the average line widths as a function of (shallow) line-of-sight angles was found, whereas the ratio of the line width amplitudes to the Doppler velocity amplitudes is relatively high for the flow model. The most robust observational signature found is that the ratio of the mean to the amplitudes of the Doppler velocity is always higher than one for the flow model. This ratio is substantially higher for flows than for waves, and for the flows model used in the study is exactly the same in the 171 Å Fe ix and the 193 Å Fe xii spectral lines. However, these potential observational signatures need to be treated cautiously because they are likely to be model-dependent.

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References

  1. Antolin, P., Van Doorsselaere, T.: 2013, Line-of-sight geometrical and instrumental resolution effects on intensity perturbations by sausage modes. Astron. Astrophys. 555, A74. DOI . ADS .

  2. Arber, T.D., Longbottom, A.W., Gerrard, C.L., Milne, A.M.: 2001, A staggered grid, Lagrangian–Eulerian remap code for 3-D MHD simulations. J. Comput. Phys. 171, 151. DOI . ADS .

  3. Banerjee, D., Gupta, G.R., Teriaca, L.: 2011, Propagating MHD waves in coronal holes. Space Sci. Rev. 158, 267. DOI . ADS .

  4. Banerjee, D., O’Shea, E., Doyle, J.G.: 2000, Long-period oscillations in polar plumes as observed by cds on soho. Solar Phys. 196, 63. DOI . ADS .

  5. Berghmans, D., Clette, F.: 1999, Active region EUV transient brightenings – First results by EIT of SOHO JOP80. Solar Phys. 186, 207. DOI . ADS .

  6. Bryans, P., Young, P.R., Doschek, G.A.: 2010, Multiple component outflows in an active region observed with the EUV imaging spectrometer on Hinode. Astrophys. J. 715, 1012. DOI . ADS .

  7. Culhane, J.L., Harra, L.K., James, A.M., Al-Janabi, K., Bradley, L.J., Chaudry, R.A., Rees, K., Tandy, J.A., Thomas, P., Whillock, M.C.R., Winter, B., Doschek, G.A., Korendyke, C.M., Brown, C.M., Myers, S., Mariska, J., Seely, J., Lang, J., Kent, B.J., Shaughnessy, B.M., Young, P.R., Simnett, G.M., Castelli, C.M., Mahmoud, S., Mapson-Menard, H., Probyn, B.J., Thomas, R.J., Davila, J., Dere, K., Windt, D., Shea, J., Hagood, R., Moye, R., Hara, H., Watanabe, T., Matsuzaki, K., Kosugi, T., Hansteen, V., Wikstol, Ø.: 2007, The EUV Imaging Spectrometer for Hinode. Solar Phys. 243, 19. DOI . ADS .

  8. De Moortel, I.: 2009, Longitudinal waves in coronal loops. Space Sci. Rev. 149, 65. DOI . ADS .

  9. De Moortel, I., Bradshaw, S.J.: 2008, Forward modelling of coronal intensity perturbations. Solar Phys. 252, 101. DOI . ADS .

  10. De Moortel, I., Hood, A.W.: 2003, The damping of slow MHD waves in solar coronal magnetic fields. Astron. Astrophys. 408, 755. DOI . ADS .

  11. De Moortel, I., Hood, A.W.: 2004, The damping of slow MHD waves in solar coronal magnetic fields. II. The effect of gravitational stratification and field line divergence. Astron. Astrophys. 415, 705. DOI . ADS .

  12. De Moortel, I., Ireland, J., Walsh, R.W.: 2000, Observation of oscillations in coronal loops. Astron. Astrophys. 355, L23. ADS .

  13. De Moortel, I., Nakariakov, V.M.: 2012, Magnetohydrodynamic waves and coronal seismology: An overview of recent results. Phil. Trans. Roy. Soc. London A 370, 3193. DOI . ADS .

  14. De Moortel, I., Hood, A.W., Ireland, J., Walsh, R.W.: 2002a, Longitudinal intensity oscillations in coronal loops observed with TRACE II. Discussion of measured parameters. Solar Phys. 209, 89. DOI . ADS .

  15. De Moortel, I., Ireland, J., Walsh, R.W., Hood, A.W.: 2002b, Longitudinal intensity oscillations in coronal loops observed with TRACE I. Overview of measured parameters. Solar Phys. 209, 61. DOI . ADS .

  16. De Pontieu, B., McIntosh, S.W.: 2010, Quasi-periodic propagating signals in the solar corona: The signature of magnetoacoustic waves or high-velocity upflows? Astrophys. J. 722, 1013. DOI . ADS .

  17. De Pontieu, B., McIntosh, S.W., Hansteen, V.H., Schrijver, C.J.: 2009, Observing the roots of solar coronal heating in the chromosphere. Astrophys. J. Lett. 701, L1. DOI . ADS .

  18. De Pontieu, B., McIntosh, S.W., Carlsson, M., Hansteen, V.H., Tarbell, T.D., Boerner, P., Martinez-Sykora, J., Schrijver, C.J., Title, A.M.: 2011, The origins of hot plasma in the solar corona. Science 331. DOI . ADS .

  19. De Pontieu, B., Title, A.M., Lemen, J.R., Kushner, G.D., Akin, D.J., Allard, B., Berger, T., Boerner, P., Cheung, M., Chou, C., Drake, J.F., Duncan, D.W., Freeland, S., Heyman, G.F., Hoffman, C., Hurlburt, N.E., Lindgren, R.W., Mathur, D., Rehse, R., Sabolish, D., Seguin, R., Schrijver, C.J., Tarbell, T.D., Wülser, J.-P., Wolfson, C.J., Yanari, C., Mudge, J., Nguyen-Phuc, N., Timmons, R., van Bezooijen, R., Weingrod, I., Brookner, R., Butcher, G., Dougherty, B., Eder, J., Knagenhjelm, V., Larsen, S., Mansir, D., Phan, L., Boyle, P., Cheimets, P.N., DeLuca, E.E., Golub, L., Gates, R., Hertz, E., McKillop, S., Park, S., Perry, T., Podgorski, W.A., Reeves, K., Saar, S., Testa, P., Tian, H., Weber, M., Dunn, C., Eccles, S., Jaeggli, S.A., Kankelborg, C.C., Mashburn, K., Pust, N., Springer, L., Carvalho, R., Kleint, L., Marmie, J., Mazmanian, E., Pereira, T.M.D., Sawyer, S., Strong, J., Worden, S.P., Carlsson, M., Hansteen, V.H., Leenaarts, J., Wiesmann, M., Aloise, J., Chu, K.-C., Bush, R.I., Scherrer, P.H., Brekke, P., Martinez-Sykora, J., Lites, B.W., McIntosh, S.W., Uitenbroek, H., Okamoto, T.J., Gummin, M.A., Auker, G., Jerram, P., Pool, P., Waltham, N.: 2014, The Interface Region Imaging Spectrograph (IRIS). Solar Phys. 289, 2733. DOI . ADS .

  20. DeForest, C.E., Gurman, J.B.: 1998, Observation of quasi-periodic compressive waves in solar polar plumes. Astrophys. J. Lett. 501, L217. DOI . ADS .

  21. Del Zanna, G.: 2008, Flows in active region loops observed by hinode EIS. Astron. Astrophys. 481, L49. DOI . ADS .

  22. Doschek, G.A., Warren, H.P., Mariska, J.T., Muglach, K., Culhane, J.L., Hara, H., Watanabe, T.: 2008, Flows and nonthermal velocities in solar active regions observed with the EUV Imaging Spectrometer on Hinode: A tracer of active region sources of heliospheric magnetic fields? Astrophys. J. 686, 1362. DOI . ADS .

  23. Hara, H., Watanabe, T., Harra, L.K., Culhane, J.L., Young, P.R., Mariska, J.T., Doschek, G.A.: 2008, Coronal plasma motions near footpoints of active region loops revealed from spectroscopic observations with Hinode EIS. Astrophys. J. 678, L67. DOI . ADS .

  24. Harra, L.K., Sakao, T., Mandrini, C.H., Hara, H., Imada, S., Young, P.R., van Driel-Gesztelyi, L., Baker, D.: 2008, Outflows at the edges of active regions: Contribution to solar wind formation? Astrophys. J. 676, L147. DOI . ADS .

  25. He, J.-S., Marsch, E., Tu, C.-Y., Guo, L.-J., Tian, H.: 2010, Intermittent outflows at the edge of an active region – A possible source of the solar wind? Astron. Astrophys. 516, A14. DOI . ADS .

  26. Lemen, J.R., Title, A.M., Akin, D.J., Boerner, P.F., Chou, C., Drake, J.F., Duncan, D.W., Edwards, C.G., Friedlaender, F.M., Heyman, G.F., Hurlburt, N.E., Katz, N.L., Kushner, G.D., Levay, M., Lindgren, R.W., Mathur, D.P., McFeaters, E.L., Mitchell, S., Rehse, R.A., Schrijver, C.J., Springer, L.A., Stern, R.A., Tarbell, T.D., Wuelser, J.-P., Wolfson, C.J., Yanari, C., Bookbinder, J.A., Cheimets, P.N., Caldwell, D., Deluca, E.E., Gates, R., Golub, L., Park, S., Podgorski, W.A., Bush, R.I., Scherrer, P.H., Gummin, M.A., Smith, P., Auker, G., Jerram, P., Pool, P., Soufli, R., Windt, D.L., Beardsley, S., Clapp, M., Lang, J., Waltham, N.: 2012, The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO). Solar Phys. 275, 17. DOI . ADS .

  27. Marsh, M.S., Walsh, R.W.: 2009, Using HINODE/Extreme-ultraviolet Imaging Spectrometer to confirm a seismologically inferred coronal temperature. Astrophys. J. Lett. 706, L76. DOI . ADS .

  28. Marsh, M.S., Walsh, R.W., Plunkett, S.: 2009, Three-dimensional coronal slow modes: Toward three-dimensional seismology. Astrophys. J. 697, 1674. DOI . ADS .

  29. McIntosh, S.W.: 2012, Recent observations of plasma and Alfvénic wave energy injection at the base of the fast solar wind. Space Sci. Rev. 172, 69. DOI . ADS .

  30. McIntosh, S.W., De Pontieu, B.: 2009a, High-speed transition region and coronal upflows in the quiet Sun. Astrophys. J. 707, 524. DOI . ADS .

  31. McIntosh, S.W., De Pontieu, B.: 2009b, Observing episodic coronal heating events rooted in chromospheric activity. Astrophys. J. 706, L80. DOI . ADS .

  32. McIntosh, S.W., Innes, D.E., de Pontieu, B., Leamon, R.J.: 2010, STEREO observations of quasi-periodically driven high velocity outflows in polar plumes. Astron. Astrophys. 510, L2. DOI . ADS .

  33. McIntosh, S.W., Tian, H., Sechler, M., De Pontieu, B.: 2012, On the Doppler velocity of emission line profiles formed in the “Coronal contraflow” that is the chromosphere-corona mass cycle. Astrophys. J. 749, 60. DOI . ADS .

  34. Nishizuka, N., Hara, H.: 2011, Spectroscopic observations of continuous outflows and propagating waves from NOAA 10942 with Extreme ultraviolet Imaging Spectrometer/Hinode. Astrophys. J. Lett. 737, L43. DOI . ADS .

  35. Ofman, L., Nakariakov, V.M., Sehgal, N.: 2000, Dissipation of slow magnetosonic waves in coronal plumes. Astrophys. J. 533, 1071. DOI . ADS .

  36. Ofman, L., Wang, T.J., Davila, J.M.: 2012, Slow magnetosonic waves and fast flows in active region loops. Astrophys. J. 754, 111. DOI . ADS .

  37. Ofman, L., Romoli, M., Poletto, G., Noci, G., Kohl, J.L.: 1997, Ultraviolet coronagraph spectrometer observations of density fluctuations in the solar wind. Astrophys. J. 491, L111. DOI . ADS .

  38. Owen, N.R., De Moortel, I., Hood, A.W.: 2009, Forward modelling to determine the observational signatures of propagating slow waves for TRACE, SoHO/CDS, and Hinode/EIS. Astron. Astrophys. 494, 339. DOI . ADS .

  39. Peter, H.: 2010, Asymmetries of solar coronal extreme ultraviolet emission lines. Astron. Astrophys. 521, A51. DOI . ADS .

  40. Sakao, T., Kano, R., Narukage, N., Kotoku, J., Bando, T., DeLuca, E.E., Lundquist, L.L., Tsuneta, S., Harra, L.K., Katsukawa, Y., Kubo, M., Hara, H., Matsuzaki, K., Shimojo, M., Bookbinder, J.A., Golub, L., Korreck, K.E., Su, Y., Shibasaki, K., Shimizu, T., Nakatani, I.: 2007, Continuous plasma outflows from the edge of a solar active region as a possible source of solar wind. Science 318. DOI . ADS .

  41. 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., McMullen, R.A., Warren, H.P., Kankelborg, C.C., Handy, B.N., de Pontieu, B.: 1999, A new view of the solar outer atmosphere by the transition region and coronal explorer. Solar Phys. 187, 261. DOI . ADS .

  42. Tian, H., McIntosh, S.W., De Pontieu, B.: 2011, The spectroscopic signature of quasi-periodic upflows in active region timeseries. Astrophys. J. 727, L37. DOI . ADS .

  43. Ugarte-Urra, I., Warren, H.P.: 2011, Temporal variability of active region outflows. Astrophys. J. 730, 37. DOI . ADS .

  44. Van Doorsselaere, T., Wardle, N., Del Zanna, G., Jansari, K., Verwichte, E., Nakariakov, V.M.: 2011, The first measurement of the adiabatic index in the solar corona using time-dependent spectroscopy of Hinode/EIS observations. Astrophys. J. Lett. 727, L32. DOI . ADS .

  45. Verwichte, E., Marsh, M., Foullon, C., Van Doorsselaere, T., De Moortel, I., Hood, A.W., Nakariakov, V.M.: 2010, Periodic spectral line asymmetries in solar coronal structures from slow magnetoacoustic waves. Astrophys. J. Lett. 724, L194. DOI . ADS .

  46. Wang, T., Ofman, L., Davila, J.M.: 2012, Spectroscopic diagnosis of propagating disturbances in coronal loops: Waves or flows? In: Golub, L., De Moortel, I., Shimizu, T. (eds.) Fifth Hinode Science Meeting, ASP Conf. Ser. 456, 91. ADS .

  47. Wang, T., Ofman, L., Davila, J.M.: 2013, Three-dimensional magnetohydrodynamic modeling of propagating disturbances in fan-like coronal loops. Astrophys. J. Lett. 775, L23. DOI . ADS .

  48. Wang, T.J., Ofman, L., Davila, J.M., Mariska, J.T.: 2009, Hinode/EIS observations of propagating low-frequency slow magnetoacoustic waves in fan-like coronal loops. Astron. Astrophys. 503, L25. DOI . ADS .

  49. Warren, H.P., Ugarte-Urra, I., Young, P.R., Stenborg, G.: 2011, The temperature dependence of solar active region outflows. Astrophys. J. 727, 58. DOI . ADS .

  50. Winebarger, A.R., Warren, H., van Ballegooijen, A., DeLuca, E.E., Golub, L.: 2002, Steady flows detected in extreme-ultraviolet loops. Astrophys. J. 567, L89. DOI . ADS .

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Acknowledgements

IDM acknowledges support of a Royal Society University Research Fellowship and a KU Leuven Research Council senior research fellowship (SF/12/008).The research leading to these results has also received funding from the European Commission Seventh Framework Programme (FP7/2007-2013) under the grant agreement SOLSPANET (project No. 269299, www.solspanet.eu/solspanet ). TVD has been sponsored by an Odysseus grant of the FWO Vlaanderen. The research was performed in the context of the IAP P7/08 CHARM (Belspo) and the GOA-2015-014 (KU Leuven). TVD acknowledges the funding from the FP7 ERG grant with number 276808. The authors would like to thank S.W. McIntosh for helpful discussions.

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De Moortel, I., Antolin, P. & Van Doorsselaere, T. Observational Signatures of Waves and Flows in the Solar Corona. Sol Phys 290, 399–421 (2015). https://doi.org/10.1007/s11207-014-0610-y

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Keywords

  • Flows
  • Magnetohydrodynamics (MHD)
  • Sun: corona
  • Waves