Abstract
The distribution of acoustic power over sunspots shows an enhanced absorption near the umbra – penumbra boundary. Previous studies revealed that the region of enhanced absorption coincides with the region of strongest transverse potential field. The aim of this paper is to i) utilize the high-resolution vector magnetograms derived using Hinode SOT/SP observations and study the relationship between the vector magnetic field and power absorption and ii) study the variation of power absorption in sunspot penumbrae due to the presence of spine-like radial structures.
It is found that i) both potential and observed transverse fields peak at a similar radial distance from the center of the sunspot, and ii) the magnitude of the transverse field, derived from Hinode observations, is much larger than the potential transverse field derived from SOHO/MDI longitudinal-field observations. In the penumbra, the radial structures called spines (intra-spines) have stronger (weaker) field strength and are more vertical (horizontal). The absorption of acoustic power in the spine and intra-spine shows different behavior, with the absorption being larger in the spine as compared to the intra-spine.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Berghmans, D., Clette, F.: 1999, Solar Phys. 186, 207.
Braun, D.C., Duvall, T.L. Jr., Labonte, B.J.: 1987, Astrophys. J. Lett. 319, L27.
Braun, D.C., Duvall, T.L. Jr., Labonte, B.J.: 1988, Astrophys. J. 335, 1015.
Bloomfield, D.S., Lagg, A., Solanki, S.K.: 2007, Astrophys. J. 671, 1005.
Cally, P.S.: 1995, Astrophys. J. 451, 372.
Chandrasekhar, S.: 1961, Hydromagnetic and Hydrodynamic Instability. International Series of Monographs on Physics, Oxford University Press, Oxford.
Davila, J.M.: 1987, Astrophys. J. 317, 514.
De Moortel, I., Ireland, J., Hood, A.W., Walsh, R.W.: 2002, Astron. Astrophys. Lett 387, 13.
De Pontieu, B., Erdélyi, R., James, S.P.: 2004, Nature 430, 536.
De Pontieu, B., Erdélyi, R., De Moortel, I.: 2005, Astrophys. J. Lett. 624, L61.
Demidov, M.L., Balthasar, H.: 2009, Solar Phys. 260, 261.
Harvey, J.W.: 1969, PhD Thesis, Univ. Colorado.
Hindman, B.W., Brown, T.M.: 1998, Astrophys. J. 504, 1029.
Hindman, B.W., Jain, R., Zweibel, E.G.: 1997, Astrophys. J. 476, 392.
Hollweg, J.V.: 1984, Astrophys. J. 277, 392.
Ichimoto, K., Lites, B., Elmore, D., Suematsu, Y., Tsuneta, S., Katsukawa, Y., Shimizu, T., Shine, R., Tarbell, T., Title, A., Kiyohara, J., Shinoda, K., Card, G., Lecinski, A., Streander, K., Nakagiri, M., Miyashita, M., Noguchi, M., Hoffmann, C., Cruz, T.: 2008, Solar Phys. 249, 233.
Ionson, J.A.: 1982, Astrophys. J. 254, 318.
Kosugi, T., Matsuzaki, K., Sakao, T., Shimizu, T., Sone, Y., Tachikawa, S., Hashimoto, T., Minesugi, K., Ohnishi, A., Yamada, T., Tsuneta, S., Hara, H., Ichimoto, K., Suematsu, Y., Shimojo, M., Watanabe, T., Shimada, S., Davis, J.M., Hill, L.D., Owens, J.K., Title, A.M., Culhane, J.L., Harra, L.K., Doschek, G.A., Golub, L.: 2007, Solar Phys. 243, 3.
Lagg, A., Woch, J., Krupp, N., Solanki, S.K.: 2004, Astron. Astrophys. 414, 1109.
Landolfi, M., Landi Degl’Innocenti, E.: 1982, Solar Phys. 78, 355.
Langhans, K., Scharmer, G.B., Kiselman, D., Löfdahl, M.G., Berger, T.E.: 2005, Astron. Astrophys. 436, 1087.
Leighton, R.B., Noyes, R.W., Simon, G.W.: 1962, Astrophys. J. 135, 474.
Lites, B.W., White, O.R., Packman, D.: 1982, Astrophys. J. 253, 386.
Lites, B.W., Elmore, D.F., Seagraves, P., Skumanich, A.P.: 1993, Astrophys. J. 418, 928.
Lites, B.W., Elmore, D.F., Streander, K.V., Hoffmann, C.M., Tarbell, T.D., Title, A.M., Shine, R.A., Ichimoto, K., Tsuneta, S., Shimizu, T., Suematsu, Y.: 2007, In: Shibata, K., Nagata, S., Sakurai, T. (eds.) New Solar Physics with Solar-B Mission CS-369, Astron. Soc. Pacific, San Francisco, 55.
Mathew, S.K.: 2008, Solar Phys. 251, 515.
Parker, E.N.: 1979, Cosmical Magnetic Fields, Oxford University Press, Oxford.
Rachkovsky, D.N.: 1972, Izv. Ordena Trud. Krasn. Znam. Krym. Astrofiz. Observ. 44, 64.
Scharmer, G.B., Gudiksen, B.V., Kiselman, D., Löfdahl, M.G., Rouppe van der Voort, L.H.M.: 2002, Nature 420, 151.
Scherrer, P.H., SDO/HMI Team: 2002, Bull. Am. Astron. Soc. 34, 735.
Schunker, H., Braun, D.C., Cally, P.S., Lindsey, C.: 2005, Astrophys. J. Lett. 621, 149.
Tran, T., Bertello, L., Ulrich, R.K., Evans, S.: 2005, Astrophys. J. Suppl. Ser. 156, 295.
Tsuneta, S., Ichimoto, K., Katsukawa, Y., Nagata, S., Otsubo, M., Shimizu, T., Suematsu, Y., Nakagiri, M., Noguchi, M., Tarbell, T., Title, A., Shine, R., Rosenberg, W., Hoffmann, C., Jurcevich, B., Kushner, G., Levay, M., Lites, B., Elmore, D., Matsushita, T., Kawaguchi, N., Saito, H., Mikami, I., Hill, L.D., Owens, J.K.: 2008, Solar Phys. 249, 167.
Ulrich, R.K., Bertello, L., Boyden, J.E., Webster, L.: 2009, Solar Phys. 255, 53.
Unno, W.: 1956, Publ. Astron. Soc. Japan 8, 108.
Venkatakrishnan, P., Gary, G.A.: 1989, Solar Phys. 120, 235.
Venkatakrishnan, P., Kumar, B., Tripathy, S.C.: 2002, Solar Phys. 211, 77.
Wang, D., Zhang, M., Li, H., Zhang, H.Q.: 2009, Solar Phys. 260, 233.
Zirin, H., Stein, A.: 1972, Astrophys. J. Lett. 178, L85.
Author information
Authors and Affiliations
Corresponding author
Additional information
Helioseismology
Guest Editors: G. Houdek, H. Shibahashi, and J. Zhao.
Rights and permissions
About this article
Cite this article
Gosain, S., Mathew, S.K. & Venkatakrishnan, P. Acoustic Power Absorption and its Relation to Vector Magnetic Field of a Sunspot. Sol Phys 268, 335–348 (2011). https://doi.org/10.1007/s11207-010-9625-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11207-010-9625-1