Abstract
The Helioseismic and Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments onboard the Solar Dynamics Observatory satellite produce Doppler velocity and continuum intensity at 6173 Å as well as intensity maps at 1600 Å and 1700 Å, which can be used for helioseismic studies at different heights in the solar photosphere. We perform a Hankel–Fourier analysis in an annulus centered around sunspots or quiet-Sun regions, to estimate the change in power of waves crossing these regions of interest. We find that there is a dependence of power-reduction coefficients α on measurement height in the photosphere: Sunspots reduce the power of outgoing waves with frequencies ν lower than ν≈4.5 mHz at all heights, but enhance the power of acoustic waves in the range ν≈4.5 – 5.5 mHz toward chromospheric heights, which is likely the signature of acoustic glories (halos). Maximum power reduction seems to occur near the continuum level and to decrease with altitude. Sunspots also impact the frequencies of outgoing waves in an altitude-dependent fashion. The quiet Sun is shown to behave like a strong power reducer for outgoing f- and p-modes at the continuum level, with a power reduction α≈15 – 20 %, and like a weak power enhancer for p-modes higher in the atmosphere. It is speculated that the surprising power reduction at the continuum level is related to granulation. In Doppler-velocity data, and unlike in intensity data, the quiet Sun behaves like a strong power reducer for granular flows.
Similar content being viewed by others
References
Benson, D., Stein, R., Nordlund, Å.: 2006, In: Uitenbroek, H., Leibacher, J., Stein, R.F. (eds.) Solar MHD Theory and Observations: A High Spatial Resolution Perspective, ASP Conf. Ser. 354, 92.
Bogdan, T.J., Brown, T.M., Lites, B.W., Thomas, J.H.: 1993, Astrophys. J. 406, 723.
Braun, D.C.: 1995, Astrophys. J. 451, 859.
Braun, D.C., Duvall, T.L. Jr., LaBonte, B.J.: 1987, Astrophys. J. 319, 27.
Braun, D.C., Duvall, T.L. Jr., LaBonte, B.J.: 1988, Astrophys. J. 335, 1015.
Braun, D.C., Duvall, T.L. Jr., LaBonte, B.J., Jefferies, S.M., Harvey, J.W., Pomerantz, M.A.: 1992, Astrophys. J. 391, 113.
Braun, D.C., Fan, Y.: 1998, Astrophys. J. 508, 105.
Braun, D.C., Lindsey, C.: 1999, Astrophys. J. 513, 79.
Brown, T.M., Bogdan, T.J., Lites, B.W., Thomas, J.H.: 1992, Astrophys. J. 394, 65.
Cally, P.S., Bogdan, T.J.: 1993, Astrophys. J. 402, 721.
Canfield, R.C., Musman, S.: 1973, Astrophys. J. 184, 13.
Chen, K.-R., Chou, D.-Y. (TON Team): 1996, Astrophys. J. 465, 985.
Chou, D.-Y., Yang, M.-H., Liang, Z.-C., Sun, M.-T.: 2009a, Astrophys. J. Lett. 690, L23.
Chou, D.-Y., Liang, Z.-C., Yang, M.-H., Zhao, H., Sun, M.-T.: 2009b, Astrophys. J. Lett. 696, L106.
Couvidat, S., Rajaguru, S.P., Wachter, R., Sankarasubramanian, K., Schou, J., Scherrer, P.H., et al.: 2012, Solar Phys. 278, 217.
Crouch, A.D., Cally, P.S., Charbonneau, P., Braun, D.C., Desjardins, M.: 2005, Mon. Not. Roy. Astron. Soc. 363, 1188.
De Pontieu, B., Erdelyi, R., James, S.P.: 2004, Nature 430, 536.
Donea, A.-C., Lindsey, C., Braun, D.C.: 2000, Solar Phys. 192, 321.
Dravins, D., Lindegren, L., Nordlund, Å.: 1981, Astron. Astrophys. 96, 345.
Duvall, T.L. Jr., Jefferies, S.M., Harvey, J.W., Pomerantz, M.A.: 1993, Nature 362, 430.
Fleck, B., Couvidat, S., Straus, T.: 2011, Solar Phys. 271, 27.
Fossum, A., Carlsson, M.: 2005, Astrophys. J. 625, 556.
Hanasoge, S.M., Couvidat, S., Rajaguru, S.P., Birch, A.C.: 2008, Mon. Not. Roy. Astron. Soc. 391, 1931.
Hanasoge, S.M.: 2009, Astron. Astrophys. 503, 595.
Hathaway, D.H., Beck, J.G., Bogart, R.S., Bachmann, K.T., Khatri, G., Petitto, J.M., et al.: 2000, Solar Phys. 193, 299.
Hill, F.: 1988, Astrophys. J. 333, 996.
Hill, F., Jain, K., Tripathy, S., Kholikov, S., Gonzalez Hernandez, I., Leibacher, J., et al.: 2011, Bull. Am. Astron. Soc. 43, P21.11.
Hindman, B.W., Brown, T.M.: 1998, Astrophys. J. 504, 1029.
Howe, R., Hill, F., Komm, R., Broomhall, A.-M., Chaplin, W.J., Elsworth, Y.: 2011, J. Phys. Conf. Ser. 271, 012058.
Howe, R., Jain, K., Bogart, R.S., Haber, D.A., Baldner, C.S.: 2012, Solar Phys. doi: 10.1007/s11207-012-0097-3 .
Jain, R., Haber, D.: 2002, Astron. Astrophys. 387, 1092.
Khomenko, E.V., Kostik, R.I., Shchukina, N.G.: 2001, Astron. Astrophys. 369, 660.
Khomenko, E.V., Collados, M.: 2006, Astrophys. J. 653, 739.
Khomenko, E.V., Centeno, R., Collados, M., Trujillo Bueno, J.: 2008, Astrophys. J. 676, 85.
Khomenko, E.V., Collados, M.: 2009, Astron. Astrophys. 506, 5.
Kostyk, R.I., Shchukina, N.G.: 1999, Astron. Lett. 25, 678.
Kostyk, R.I., Shchukina, N.G., Khomenko, E.V.: 2006, Astron. Rep. 50, 588.
Lemen, J.R., Title, A.M., Akin, D.J., Boerner, P.F., Chou, C., Drake, J.F., et al.: 2012, Solar Phys. 275, 17.
Lindsey, C., Braun, D.C.: 1998, Astrophys. J. 499, 99.
McIntosh, S.W., Jefferies, S.M.: 2006, Astrophys. J. 647, 77.
Norton, A.A., Graham, J.P., Ulrich, R.K., Schou, J., Tomczyk, S., Liu, Y., et al.: 2006, Solar Phys. 239, 69.
Parchevsky, K., Kosovichev, A.G.: 2007, Astrophys. J. 666, 547.
Rajaguru, S.P., Wachter, R., Hasan, S.S.: 2006, In: Gopalswamy, N., Bhattacharyya, A. (eds.) Solar Influence on the Heliosphere and Earth’s Environment: Recent Progress and Prospects, Quest Publications, Madras, 21.
Rajaguru, S.P., Sankarasubramanian, K., Wachter, R., Scherrer, P.H.: 2007, Astrophys. J. 654, 175.
Rajaguru, S.P., Wachter, R., Sankarasubramanian, K., Couvidat, S.: 2010, Astrophys. J. 721, 86.
Rajaguru, S.P., Couvidat, S., Sun, X., Hayashi, K., Schunker, H.: 2012, Solar Phys., submitted.
Roberts, B.: 1983, Solar Phys. 87, 77.
Roth, M., Franz, M., Bello González, N., Martínez Pillet, V., Bonet, J.A., Gandorfer, A., et al.: 2010, Astrophys. J. 723, 175.
Scherrer, P.H., Bogart, R.S., Bush, R.I., Hoeksema, J.T., Kosovichev, A.G., Schou, J., et al.: 1995, Solar Phys. 162, 129.
Schou, J., Scherrer, P.H., Bush, R.I., Wachter, R., Couvidat, S., Rabello-Soares, M.C., et al.: 2012, Solar Phys. 275, 229.
Spruit, H.C., Bogdan, T.J.: 1992, Astrophys. J. 391, 109.
Stein, R.F., Nordlund, Å.: 2000, Solar Phys. 192, 91.
Stodilka, M.I.: 2010, Kinemat. Phys. Celest. Bodies 26, 71.
Sun, M.-T., Chou, D.-Y., Lin, C.-H., TON Team: 1997, Solar Phys. 176, 59.
Woods, D.T., Cram, L.E.: 1981, Solar Phys. 69, 233.
Zhang, H.: 1997, Astrophys. J. 479, 1012.
Acknowledgements
This work was supported by NASA Grant NAS5-02139 (HMI). The data used here are courtesy of NASA/SDO and the HMI and AIA science teams. We thank Douglas C. Braun for providing his Hankel–Fourier analysis codes, and Thomas L. Duvall, Jr., for his help, numerous advice, and suggestions regarding the role of granulation in our results. We also thank Robert F. Stein for providing his 96 Mm-wide numerical simulation results. Finally, we are grateful to the anonymous referee whose suggestions improved this paper.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Couvidat, S. Oscillation Power in Sunspots and Quiet Sun from Hankel Analysis Performed on SDO/HMI and SDO/AIA Data. Sol Phys 282, 15–38 (2013). https://doi.org/10.1007/s11207-012-0128-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11207-012-0128-0