Abstract
Following Couvidat (Solar Phys. 282, 15, 2013), we analyze data from the Helioseismic and Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments onboard the Solar Dynamics Observatory. Doppler velocity and continuum intensity at 6173 Å as well as intensity maps at 1600 Å and 1700 Å are studied on 14 active regions and four quiet-Sun regions at four heights in the solar photosphere. A Hankel–Fourier analysis is performed around these regions of interest. Outgoing–ingoing scattering phase shifts at a given atmospheric height are computed, as well as ingoing–ingoing and outgoing–outgoing phase differences between two atmospheric heights. The outgoing–ingoing phase shifts produced by sunspots show little dependence on measurement height, unlike the acoustic power reduction measured in Couvidat (2013). Phenomena happening above the continuum level, like acoustic glories, appear not to have a significant effect on the phases. However, there is a strong dependence on sunspot size, line-of-sight magnetic flux, and intensity contrast. As previously suggested by other groups, the region of wave scattering appears both horizontally smaller and vertically less extended than the region of acoustic power suppression, and occurs closer to the surface. Results presented here should help refine theoretical models of acoustic wave scattering by magnetic fields. Ingoing–ingoing phase differences between two measurement heights are also computed and show a complex pattern highly dependent on atmospheric height. In particular, a significant sensitivity of AIA signals to lower chromospheric layers is shown. Finally, ingoing–ingoing minus outgoing–outgoing phase differences between various measurement heights are discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Borrero, J.M., Ichimoto, K.: 2011, Living Rev. Solar Phys. 8(4). http://solarphysics.livingreviews.org/Articles/lrsp-2011-4/ .
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., Jefferies, S.M., Harvey, J.W., Pomerantz, M.A.: 1992, Astrophys. J. 391, 113.
Cally, P.S., Crouch, A.D., Braun, D.C.: 2003, Mon. Not. Roy. Astron. Soc. 346, 381.
Chou, D.-Y., Chen, C.-K.: 1993, In: 1993 Annual GONG Meeting Abstracts, Global Oscillation Network Group Report 10, 26.
Couvidat, S.: 2013, Solar Phys. 282, 15.
Couvidat, S., Birch, A.C., Kosovichev, A.G.: 2006, Astrophys. J. 640, 516.
Crouch, A.D., Cally, P.S., Charbonneau, P., Braun, D.C., Desjardins, M.: 2005, Mon. Not. Roy. Astron. Soc. 363, 1188.
Deubner, F.-L., Waldschik, T., Steffens, S.: 1996, Astron. Astrophys. 307, 936.
Deubner, F.-L., Fleck, B., Marmolino, C., Severino, G.: 1990, Astron. Astrophys. 236, 509.
Deubner, F.-L., Fleck, B., Schmitz, F., Straus, T.: 1992, Astron. Astrophys. 266, 560.
Fan, Y., Braun, D.C., Chou, D.-Y.: 1995, Astrophys. J. 451, 877.
Gordovskyy, M., Jain, R.: 2007a, Astron. Nachr. 328, 309.
Gordovskyy, M., Jain, R.: 2007b, Astrophys. J. 661, 586.
Gordovskyy, M., Jain, R., Thompson, M.J.: 2006, In: Thompson, M. (ed.) Proceedings of SOHO 18/GONG 2006/HELAS I, Beyond the Spherical Sun, ESA SP-624, 14.1 (on CDROM).
Hill, F., Jain, K., Tripathy, S., Kholikov, S., Gonzalez Hernandez, I., Leibacher, J., et al.: 2011, Bull. Am. Astron. Soc. 43, 21.11.
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. 281(2), 533–549.
Kosovichev, A.G., Duvall, T.L. Jr., Scherrer, P.H.: 2000, Solar Phys. 192, 159.
Krijger, J.M., Rutten, R.J., Lites, B.W., Straus, T., Shine, R.A., Tarbell, T.D.: 2001, Astron. Astrophys. 379, 1052.
Lemen, J.R., Title, A.M., Akin, D.J., Boerner, P.F., Chou, C., Drake, J.F., et al.: 2012, Solar Phys. 275, 17.
Marmolino, C., Severino, G.: 1991, Astron. Astrophys. 242, 271.
Marmolino, C., Severino, G., Deubner, F.-L., Fleck, B.: 1993, Astron. Astrophys. 278, 617.
Mihalas, B.W., Toomre, J.: 1982, Astrophys. J. 263, 386.
Oliviero, M., Severino, G., Straus, T., Jefferies, S.M., Appourchaux, T.: 1999, Astron. Astrophys. 516, L45.
Rabello-Soares, M.C., Korzennik, S.G., Schou, J.: 2008, Solar Phys. 257, 197.
Rajaguru, S.P., Couvidat, S., Sun, X., Hayashi, K., Schunker, H.: 2012, Solar Phys. doi: 10.1007/s11207-012-0180-9 .
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.
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. The author thanks M.C. Rabello-Soares for providing him with a set of p-mode oscillation frequencies from the MDI instrument. The author also thanks the anonymous referee for useful comments and suggestions.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Couvidat, S. Multi-height Scattering Phase Shifts from Sunspots and Phase Differences Between Photospheric Heights with SDO/HMI and AIA Data. Sol Phys 289, 721–743 (2014). https://doi.org/10.1007/s11207-013-0371-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11207-013-0371-z