Abstract
From 16 to 21 August 2010, a northern (∼ N60) polar crown filament was observed by Solar Dynamics Observatory (SDO). Employing the six-day SDO/AIA data, we identify 69 barbs, and select 58 of them, which appeared away from the western solar limb (≤ W60), as our sample. We systematically investigate the evolution of filament barbs. Three different types of apparent formation of barbs are detected, including i) the convergence of surrounding moving plasma condensations, comprised 55.2 % of our sample, ii) the flows of plasma condensations from the filament, comprised 37.9 %, and iii) the plasma injections from the neighboring brightening regions, comprised 6.9 %. We also find three different ways that barb disappear, involving: i) bi-lateral movements (44.8 %), and ii) outflowing of barb plasma (27.6 %) results in the disappearance of a barb, as well as iii) disappearance of a barb is associated with a neighboring brightening (27.6 %). The evolution of the magnetic fields, e.g. emergence and cancellation of magnetic flux, may cause the formation or disappearance of the barb magnetic structures. Barbs exchange plasma condensations with the surrounding atmosphere, filament, and nearby brightenings, leading to the increase or drainage of barb material. Furthermore, we find that all the barbs undergo oscillations. The average oscillation period, amplitude, and velocity are 30 min, 2.4 Mm, and 5.7 km s−1, respectively. Besides the oscillations, 21 (36 %) barbs manifested sideward motions having an average speed of 0.45 km s−1. Small-scale wave-like propagating disturbances caused by small-scale brightenings are detected, and the barb oscillations associated with these disturbances are also found. We propose that the kinematics of barbs are influenced or even caused by the evolution of the neighboring photospheric magnetic fields.
Similar content being viewed by others
References
Ahn, K., Chae, J., Cao, W.D., Goode, P.R.: 2010, Astrophys. J. 721, 74.
Antiochos, S.K., Klimchuk, J.A.: 1991, Astrophys. J. 378, 372.
Antiochos, S.K., MacNeice, P.J., Spicer, D.S., Klimchuk, J.A.: 1999, Astrophys. J. 512, 985.
Aschwanden, M., Schrijver, C.J., Alexander, D.: 2001, Astrophys. J. 550, 1036.
Aulanier, G., Démoulin, P.: 1998, Astron. Astrophys. 329, 1125.
Aulanier, G., Démoulin, P., van Driel-Gesztelyi, L., Mein, P., Deforest, C.: 1998, Astron. Astrophys. 335, 309.
Aulanier, G., Démoulin, P., Mein, N., van Driel-Gesztelyi, L., Mein, P., Schmieder, B.: 1999, Astron. Astrophys. 342, 867.
Aulanier, G., Schmieder, B.: 2002, Astron. Astrophys. 386, 1106.
Babcock, H.W., Babcock, H.D.: 1955, Astrophys. J. 121, 349.
Berger, T.E., Shine, R.A., Slater, G.L., Tarbell, T.D., Title, A.M., Okamoto, T.J., et al.: 2008, Astrophys. J. Lett. 676, 89.
Cao, W.D., Ahn, K., Goode, P.R., Shumko, S., Gorceix, N., Coulter, R.: 2011, ASP Conf. 437, 345.
Chae, J.: 2001, Astrophys. J. Lett. 560, L95.
Chae, J., Moon, Y.-J., Park, Y.D.: 2005, Astrophys. J. 626, 574.
Chen, P.F., Innes, D.E., Solanki, S.K.: 2008, Astron. Astrophys. 484, 487.
Deng, Y., Schmieder, B., Engvold, O., DeLuca, E., Golub, L.: 2000, Solar Phys. 195, 347.
Deng, Y., Lin, Y., Schmieder, B., Engvold, O.: 2002, Solar Phys. 209, 153.
Ding, M.D., Chen, Q.R., Li, J.P., Chen, P.F.: 2003, Astrophys. J. 598, 683.
Engvold, O., Jakobsson, H., Tandberg-Hanssen, E., Gurman, J.B., Moses, D.: 2001, Solar Phys. 202, 293.
Heinzel, P., Anzer, U.: 2001, Astron. Astrophys. 375, 1090.
Hirayama, T.: 1985, Solar Phys. 100, 415.
Isobe, H., Tripathi, D.: 2006, Astron. Astrophys. 449, 17.
Ji, H.S., Wang, H.M., Schmahl, E.J., Moon, Y.-J., Jiang, Y.C.: 2003, Astrophys. J. Lett. 595, L135.
Jiang, Y.C., Wang, J.X.: 2001, Astron. Astrophys. 367, 1022.
Jing, J., Lee, J., Spirock, T.J., Xu, Y., Wang, H.M., Choe, G.S.: 2003, Astrophys. J. Lett. 584, L103.
Karpen, J.T., Antiochos, S.K., Hohensee, M., Klimchuk, J.A., MacNeice, P.J.: 2001, Astrophys. J. Lett. 553, L85.
Karpen, J.T., Antiochos, S.K.: 2008, Astrophys. J. 676, 658.
Lemen, J.R., Title, A.M., Akin, D.J., Boerner, P.F., Chou, C., Drake, J.F., et al.: 2012, Solar Phys. 275, 17.
Lin, Y., Engvold, O.R., Wiik, J.E.: 2003, Solar Phys. 216, 109.
Lin, Y., Engvold, O., Rouppe van der Voort, L., Wiik, J.E., Berger, T.E.: 2005, Solar Phys. 226, 239.
Lin, Y., Engvold, O., Rouppe van der Voort, L.H.M., van Noort, M.: 2007, Solar Phys. 246, 65.
Lin, Y., Martin, S.F., Engvold, O.: 2008, In: Howe, R., Komm, R.W., Balasubramaniam, K.S., Petrie, G.J.D. (eds.) Subsurface and Atmospheric Influences on Solar Activity, ASP Conf. Ser. 383, ASP, San Francisco, 235.
Lin, Y., Soler, R., Engvold, O., Ballester, J.L., Langangen, O., Oliver, R., et al.: 2009, Astrophys. J. 704, 870.
Lin, Y.: 2011, Space Sci. Rev. 158, 237.
Liu, R., Xu, Y., Wang, H.M.: 2010, Mem. Soc. Astron. Ital. 81, 796.
Liu, Y., Kurokawa, H.: 2004, Publ. Astron. Soc. Japan 56, 497.
Mackay, D.H., van Ballegooijen, A.A.: 2009, Solar Phys. 260, 321.
Mackay, D.H., Karpen, J.T., Ballester, J.L., Schmieder, B., Aulanier, G.: 2010, Space Sci. Rev. 151, 333.
Martens, P.C., Zwaan, C.: 2001, Astrophys. J. 538, 872.
Martin, S.F., Bilimoria, R., Tracadas, P.W.: 1994, In: Rutten, R.J., Schrijver, C.J. (eds.) Solar Surface Magnetism, 303.
Martin, S.F., Echols, C.R.: 1994, In: Rutten, R.J., Schrijver, C.J. (eds.) Solar Surface Magnetism, 339.
Martin, S.F.: 1998, Solar Phys. 182, 107.
Martin, S.F.: 2001, In: Murdin, P. (ed.) Encyclopedia of Astronomy and Astrophysics, Institute of Physics Publishing, Bristol, 2698.
Martin, S.F., Lin, Y., Engvold, O.: 2008, Solar Phys. 250, 31.
Martres, M.J., Michard, R., Soru-Escaut, I.: 1966, Ann. Astrophys. 29, 249.
Ning, Z.J., Cao, W.D., Goode, P.R.: 2009, Astrophys. J. 707, 1124.
Ning, Z.J., Cao, W.D., Okamoto, T.J., Ichimoto, K., Qu, Z.Q.: 2009, Astron. Astrophys. 499, 595.
Okamoto, T.J., Tsuneta, S., Berger, T.E., Ichimoto, K., Katsukawa, Y., Lites, B.W., et al.: 2007, Science 318, 1577.
Oliver, R., Ballester, J.L.: 2002, Solar Phys. 206, 45.
Rust, D.M., Kumar, A.: 1994, Solar Phys. 155, 69.
Rust, D.M., LaBonte, B.J.: 2005, Astrophys. J. Lett. 622, L69.
Schmieder, B., Bommier, V., Kitai, T., Matsumoto, T., Ishii, T.T., Hagino, M., et al.: 2008, Solar Phys. 247, 321.
Schou, J., Scherrer, P.H., Bush, R.I., Wachter, R., Couvidat, S., Rabello-Soares, M.C., et al.: 2012, Solar Phys. 275, 229.
Tripathi, D., Isobe, H., Jain, R.: 2009, Space Sci. Rev. 149, 283.
van Ballegooijen, A.A.: 2004, Astrophys. J. 612, 127.
Wang, J.X., Shi, Z.X., Martin, S.F.: 1996, Astron. Astrophys. 316, 201.
Wang, Y.-M.: 1999, Astrophys. J. Lett. 520, L71.
Wang, Y.-M.: 2001, Astrophys. J. 560, 456.
Wang, Y.-M., Muglach, K.: 2007, Astrophys. J. 666, 1284.
Wang, Y.M., Muglach, K., Kliem, B.: 2009, Astrophys. J. 699, 133.
Zhang, J., Wang, J.X.: 2001, Astrophys. J. 554, 474.
Zhang, J., Liu, Y.: 2011, Astrophys. J. Lett. 741, L7.
Zhou, G.P., Wang, J.X., Zhang, J., Chen, P.F., Ji, H.S., Dere, K.: 2006, Astrophys. J. 651, 1238.
Zirker, J.B.: 1989, Solar Phys. 119, 341.
Zirker, J.B., Engvold, O., Martin, S.F.: 1998, Nature 396, 440.
Acknowledgements
We thank the anonymous referees for many valuable comments that helped us to improve the paper substantially. The authors are indebted to the SDO teams for providing the data. The work is supported by the National Natural Science Foundations of China (G11003026, 11025315, 41074123, 40890161, 10973019, 40974112, 10873020, 10921303, 11003024), the National Basic Research Program of China under grant G2011CB811403, and the CAS KJCX2-EW-T07.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Li, L., Zhang, J. The Evolution of Barbs of a Polar Crown Filament Observed by SDO. Sol Phys 282, 147–174 (2013). https://doi.org/10.1007/s11207-012-0122-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11207-012-0122-6