Abstract
We investigate p-mode absorption in a sunspot using SOHO/MDI high-resolution Doppler images. The Doppler power computed from a 3.5-hour data set is used for studying the absorption in a sunspot. The result shows an enhancement in absorption near the umbral – penumbral boundary of the sunspot. We attempt to relate the observed absorption with the magnetic-field structure of the sunspot. The transverse component of the potential field is computed by using the observed SOHO/MDI line-of-sight magnetograms. A comparison of the power map and the computed potential field shows enhanced absorption near the umbral – penumbral boundary where the computed transverse field strength is higher.
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Braun, D.C.: 1995, Astrophys. J. 451, 859.
Braun, D.C., Duvall, T.L. Jr., LaBonte, B.J.: 1987, Astrophys. J. 319, L27.
Brown, T.M., Bogdan, T.J., Lites, B.W., Thomas, J.H.: 1992, Astrophys. J. 394, L65.
Cally, P.S., Bogdan, T.J.: 1993, Astrophys. J. 402, 732.
Cally, P.S., Bogdan, T.J., Zweibel, E.G.: 1994, Astrophys. J. 437, 505.
Cally, P.S.: 2000, Solar Phys. 192, 395.
Cally, P.S., Crouch, A.D., Braun, D.C.: 2003, Mon. Not. Roy. Astron. Soc. 346, 381.
Hagyard, M.J.: 1987, Solar Phys. 107, 239.
Hindman, B.W., Brown, T.M.: 1998, Astrophys. J. 504, 1029.
Keppens, R., Martinez Pillet, V.: 1996, Astron. Astrophys. 316, 229.
Lindsey, C., Braun, D.C.: 2005, Astrophys. J. 620, 1107.
Mathew, S.K., Lagg, A., Solanki, S.K., Collados, M., Borrero, J.M., Berdyugina, S., Krupp, N., Woch, J., Frutiger, C.: 2003, Astron. Astrophys. 410, 695.
Muglach, K., Hofmann, A., Staude, J.: 2005, Astron. Astrophys. 437, 1055.
Rajaguru, S.P., Sankarasubramanian, K., Wachter, R., Scherrer, P.H.: 2007, Astrophys. J. 654, L175.
Rosenthal, C.S., Julien, K.A.: 2000, Astrophys. J. 532, 1230.
Sakurai, T.: 1989, Space Sci. Rev. 51, 11.
Scherrer, P.H., Bogart, R.S., Bush, R.I., Hoeksema, J.T., Kosovichev, A.G., Schou, J., Rosenberg, W., Springer, L., Tarbell, T.D., Title, A., Wolfson, C.J., Zayer, I., the MDI Engineering Team: 1995, Solar Phys. 162, 129.
Spruit, H.C.: 1991, In: Toomre, J., Gough, D.O. (eds.) Lecture Notes in Physics: Challenges to Theories of the Structure of Moderate Mass Stars 388, Springer, Berlin, 121.
Spruit, H.C.: 1996, Bull. Astron. Soc. India. 24, 211.
Spruit, H.C., Bogdan, T.J.: 1992, Astrophys. J. 391, L109.
Tarbell, T., Peri, M., Frank, Z., Shine, R., Title, A.: 1988, In: Rolfe, E. (ed.) Seismology of the Sun and Sun-Like Stars SP-286, ESA, Noordwijk, 315.
Venkatakrishnan, P., Kumar, B., Tripathy, S.C.: 2002, Solar Phys. 211, 77.
Westendorp Plaza, C., Del Toro Iniesta, J.C., Ruiz Cobo, B., Martinez Pillet, V., Lites, B.W., Skumanich, A.: 2001, Astrophys. J. 547, 1130.
Woods, D.T., Cram, L.E.: 1981, Solar Phys. 69, 233.
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Helioseismology, Asteroseismology, and MHD Connections
Guest Editors: Laurent Gizon and Paul Cally.
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Mathew, S.K. Enhanced p-Mode Absorption Seen Near the Sunspot Umbral – Penumbral Boundary. Sol Phys 251, 515–522 (2008). https://doi.org/10.1007/s11207-008-9246-0
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DOI: https://doi.org/10.1007/s11207-008-9246-0