Abstract
Ellerman bombs are bright emission features observed in the wings of Hα, usually in the vicinity of magnetic concentrations. Here we show that they can also be detected in the Ca II infrared triplet lines, which are easier to interpret and therefore allow for more detailed diagnostics. We present full Stokes observations of the 849.8 and 854.2 nm lines acquired with the new spectro-polarimeter SPINOR. The data show no significant linear polarization at the level of 3 × 10−4. The circular polarization profiles exhibit measureable signals with a very intricate pattern of peaks. A non-LTE analysis of the spectral profiles emerging from these features reveals the presence of strong downflows (∼10 {km s−1}) in a hot layer between the upper photosphere and the lower chromosphere.
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References
Bruzek, A.: 1972, newblock solphys 26, 94.
Dara, H.C., Alissandrakis, C.E., Zachariadis, T.G., and Georgakilas, A.A.: 1997, aap 322, 653.
Ellerman, F.: 1917, apj 46, 298.
Georgoulis, M.K., Rust, D.M., Bernasconi, P., and Schmieder, B.: 2002, apj 575, 506.
Harvey, J. and Harvey, K.: 1973, solphys 28, 61.
Kitai, R.: 1983, solphys 87, 135.
Koval, A.N. and Severny, A.B.: 1970, solphys 11, 276.
Litvinenko, A.: 1999, apj 515, 435.
Nindos, A. and Zirin, H.: 1998 solphys 182, 381.
Pariat, E., Aulanier, G., Schmieder, B., Georgoulis, M. K., Rust, D.M., and Bernasconi, P.: 2004 apj 614, 1099.
Qiu, J., Ming, D.D., Wang, H., Denker, C., and Goode, P.R.: 2000 apj 544, L157.
Ren, D., Hegwer, S.L., Rimmele, T., Didkovsky, L.V., and Goode, P.R.: 2003, in S.L. Keil and S.V. Avakyan (eds.), Innovative Telescopes and Instrumentation for Solar Astrophysics. Proceedings of the SPIE, 4853, 593.
Rust, D.M. and Keil, S.L.: 1992, solphys 140, 55.
Rust, D.: 2001, Encycl. Astron. Astrophys., E2263R.
Rybicki, G.B. and Hummer, D.G.: 1992, aap 262, 209.
Shimizu, T., Shine, R.A., Title, A., Tarbell, T., and Frank, Z.: 2002, apj 574, 1074.
Socas-Navarro, H.: 2005a, apjl 633, L57.
Socas-Navarro, H.: 2005b, apjl 631, L167.
Socas-Navarro, H., Elmore, D., Pietarila, A., Darnell, A., Lites B.W., and Tomczyk, S.: 2006, solphys 235, 55.
Socas-Navarro, H., Ruiz Cobo, B., and Trujillo Bueno, J.: 1998, apj 507, 470.
Socas-Navarro, H. and Trujillo Bueno, J.: 1997, apj 490, 383.
Socas-Navarro, H., Trujillo Bueno, J., and Ruiz Cobo, B.: 2000a, Science 288, 1396.
Socas-Navarro, H., Trujillo Bueno, J., and Ruiz Cobo, B.: 2000b, apj 530, 977.
Socas-Navarro, H., Trujillo Bueno, J., and Ruiz Cobo, B.: 2001, apj 550, 1102.
Uitenbroek, H.: 1989, aap 213, 360.
Vernazza, J.E., Avrett, E.H., and Loeser, R.: 1981, apjs 45, 635.
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Visiting Astronomers, National Solar Observatory, operated by the Association of Universities for Research in Astronomy, Inc. (AURA), under cooperative agreement with the National Science Foundation.
The National Center for Atmospheric Research (NCAR) is sponsored by the National Science Foundation, USA.
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Socas-Navarro, H., Pillet, V.M., Elmore, D. et al. Spectro-Polarimetric Observations and Non-Lte Modeling of Ellerman Bombs. Sol Phys 235, 75–86 (2006). https://doi.org/10.1007/s11207-006-0049-x
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DOI: https://doi.org/10.1007/s11207-006-0049-x