Solar Physics

, Volume 256, Issue 1–2, pp 87–100 | Cite as

Automated Coronal Hole Detection Using Local Intensity Thresholding Techniques

STEREO SCIENCE RESULTS AT SOLAR MINIMUM

Abstract

We identify coronal holes using a histogram-based intensity thresholding technique and compare their properties to fast solar wind streams at three different points in the heliosphere. The thresholding technique was tested on EUV and X-ray images obtained using instruments onboard STEREO, SOHO and Hinode. The full-disk images were transformed into Lambert equal-area projection maps and partitioned into a series of overlapping sub-images from which local histograms were extracted. The histograms were used to determine the threshold for the low intensity regions, which were then classified as coronal holes or filaments using magnetograms from the SOHO/MDI. For all three instruments, the local thresholding algorithm was found to successfully determine coronal hole boundaries in a consistent manner. Coronal hole properties extracted using the segmentation algorithm were then compared with in situ measurements of the solar wind at ∼ 1 AU from ACE and STEREO. Our results indicate that flux tubes rooted in coronal holes expand super-radially within 1 AU and that larger (smaller) coronal holes result in longer (shorter) duration high-speed solar wind streams.

Keywords

Sun: coronal holes Automated detection Sun: magnetic fields Sun: solar wind, disturbances 

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References

  1. Altschuler, M.D., Trotter, D.E., Orrall, F.Q.: 1972, Solar Phys. 26, 354. CrossRefADSGoogle Scholar
  2. Antiochos, S.K., DeVore, C.R., Karpen, J.T., Mikić, Z.: 2007, Astrophys. J. 671, 936. CrossRefADSGoogle Scholar
  3. Antonucci, E., Dodero, M.A., Giordano, S., Krishnakumar, V., Noci, G.: 2004, Astron. Astrophys. 416, 749. CrossRefADSGoogle Scholar
  4. Belkasim, S., Ghazal, A., Basir, O.A.: 2003, Digit. Signal Process. 13, 635. CrossRefGoogle Scholar
  5. Blush, L.M., Allegrini, F., Bochsler, P., Daoudi, H., Galvin, A., Karrer, R., Kistler, L., Klecker, B., Möbius, E., Opitz, A., Popecki, M., Thompson, B., Wimmer-Schweingruber, R.F., Wurz, P.: 2005, Adv. Space Res. 36, 1544. CrossRefADSGoogle Scholar
  6. Chapman, S.A.: 2007, PhD thesis, University of Central Lancashire, Preston, UK. Google Scholar
  7. Chapman, S.A., Bromage, B.J.I.: 2002, In: Wilson, A. (ed.) From Solar Min to Max: Half a Solar Cycle with SOHO SP-508, ESA, Noordwijk, 383. Google Scholar
  8. Chiu, M.C., von-Mehlem, U.I., Willey, C.E., Betenbaugh, T.M., Maynard, J.J., Krein, J.A., Conde, R.F., Gray, W.T., Hunt, J.W. Jr., Mosher, L.E., McCullough, M.G., Panneton, P.E., Staiger, J.P., Rodberg, E.H.: 1998, Space Sci. Rev. 86, 257. CrossRefADSGoogle Scholar
  9. DeForest, C.E., Lamy, P.L., Llebaria, A.: 2001, Astrophys. J. 560, 490. CrossRefADSGoogle Scholar
  10. Delaboudinière, J.P., Artzner, G.E., Brunaud, J., Gabriel, A.H., Hochedez, J.F., Millier, F., Song, X.Y., Au, B., Dere, K.P., Howard, R.A., Kreplin, R., Michels, D.J., Moses, J.D., Defise, J.M., Jamar, C., Rochus, P., Chauvineau, J.P., Marioge, J.P., Catura, R.C., Lemen, J.R., Shing, L., Stern, R.A., Gurman, J.B., Neupert, W.M., Maucherat, A., Clette, F., Cugnon, P., van Dessel, E.L.: 1995, Solar Phys. 162, 291. CrossRefADSGoogle Scholar
  11. Delouille, V., Barra, V., Hochedez, J.: 2007, In: AGU Fall Meeting Abstracts, SH13A-1107. Google Scholar
  12. Freeland, S.L., Handy, B.N.: 1998, Solar Phys. 182, 497. CrossRefADSGoogle Scholar
  13. Fujiki, K., Hirano, M., Kojima, M., Tokumaru, M., Baba, D., Yamashita, M., Hakamada, K.: 2005, Adv. Space Res. 35, 2185. CrossRefADSGoogle Scholar
  14. Gallagher, P.T., Phillips, K.J.H., Harra-Murnion, L.K., Keenan, F.P.: 1998, Astron. Astrophys. 335, 733. ADSGoogle Scholar
  15. Gallagher, P.T., Mathioudakis, M., Keenan, F.P., Phillips, K.J.H., Tsinganos, K.: 1999, Astrophys. J. 524, L133. CrossRefADSGoogle Scholar
  16. Golub, L., Deluca, E., Austin, G., Bookbinder, J., Caldwell, D., Cheimets, P., Cirtain, J., Cosmo, M., Reid, P., Sette, A., Weber, M., Sakao, T., Kano, R., Shibasaki, K., Hara, H., Tsuneta, S., Kumagai, K., Tamura, T., Shimojo, M., McCracken, J., Carpenter, J., Haight, H., Siler, R., Wright, E., Tucker, J., Rutledge, H., Barbera, M., Peres, G., Varisco, S.: 2007, Solar Phys. 243, 63. CrossRefADSGoogle Scholar
  17. Gonzalez, R.C., Woods, R.E.: 2002, Digital Image Processing, 2nd edn., Prentice-Hall, Upper-Saddle River. Google Scholar
  18. Guhathakurta, M., Fisher, R.: 1998, Astrophys. J. 499, 215. CrossRefADSGoogle Scholar
  19. Harrison, R.A.: 1997, In: Wilson, A. (ed.) Fifth SOHO Workshop: The Corona and Solar Wind Near Minimum Activity SP-404, ESA, Noordwijk, 7. Google Scholar
  20. Harvey, K.L., Recely, F.: 2002, Solar Phys. 211, 31. CrossRefADSGoogle Scholar
  21. Hassler, D.M., Dammasch, I.E., Lemaire, P., Brekke, P., Curdt, W., Mason, H.E., Vial, J.C., Wilhelm, K.: 1999, Science 283, 810. CrossRefADSGoogle Scholar
  22. Henney, C.J., Harvey, J.W.: 2005, In: Sankarasubramanian, K., Penn, M., Pevtsov, A. (eds.) Large-Scale Structures and Their Role in Solar Activity CS-346, Astron. Soc. Pac., San Francisco, 261. Google Scholar
  23. Kano, R., Sakao, T., Hara, H., Tsuneta, S., Matsuzaki, K., Kumagai, K., Shimojo, M., Minesugi, K., Shibasaki, K., Deluca, E.E., Golub, L., Bookbinder, J., Caldwell, D., Cheimets, P., Cirtain, J., Dennis, E., Kent, T., Weber, M.: 2008, Solar Phys. 249, 263. CrossRefADSGoogle Scholar
  24. Kavanagh, A., Denton, M.: 2007, Astron. Geophys. 48(6), 6.24. CrossRefGoogle Scholar
  25. Krieger, A.S., Timothy, A.F., Roelof, E.C.: 1973, Solar Phys. 29, 505. CrossRefADSGoogle Scholar
  26. Lionello, R., Linker, J.A., Mikić, Z., Riley, P.: 2006, Astrophys. J. 642, 69. CrossRefADSGoogle Scholar
  27. Luhmann, J.G., Li, Y., Zhao, X., Yashiro, S.: 2003, Solar Phys. 213, 367. CrossRefADSGoogle Scholar
  28. Malanushenko, O.V., Jones, H.P.: 2005, Solar Phys. 226, 3. CrossRefADSGoogle Scholar
  29. McAteer, R.T.J., Gallagher, P.T., Ireland, J., Young, C.A.: 2005, Solar Phys. 228, 55. CrossRefADSGoogle Scholar
  30. Munro, R.H., Withbroe, G.L.: 1972, Astrophys. J. 176, 511. CrossRefADSGoogle Scholar
  31. Odstrcil, D.: 2003, Adv. Space Res. 32, 497. CrossRefADSGoogle Scholar
  32. Pisanko, Y.V.: 1997, Solar Phys. 172, 345. CrossRefADSGoogle Scholar
  33. Reeves, E.M., Parkinson, W.H.: 1970, Astrophys. J. Suppl. 21, 1. CrossRefADSGoogle Scholar
  34. Roussev, I.I., Gombosi, T.I., Sokolov, I.V., Velli, M., Manchester, W. IV, DeZeeuw, D.L., Liewer, P., Tóth, G., Luhmann, J.: 2003, Astrophys. J. 595, 57. CrossRefADSGoogle Scholar
  35. 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., MDI Engineering Team: 1995, Solar Phys. 162, 129. CrossRefADSGoogle Scholar
  36. Scholl, I.F., Habbal, S.R.: 2008, Solar Phys. 248, 425. CrossRefADSGoogle Scholar
  37. Schrijver, C.J., DeRosa, M.L.: 2003, Solar Phys. 212, 165. CrossRefADSGoogle Scholar
  38. Schwadron, N.A., McComas, D.J.: 2003, Astrophys. J. 599, 1395. CrossRefADSGoogle Scholar
  39. Sheeley, N.R. Jr., Wang, Y.M.: 2002, Astrophys. J. 579, 874. CrossRefADSGoogle Scholar
  40. Temmer, M., Vršnak, B., Veronig, A.M.: 2007, Solar Phys. 241, 371. CrossRefADSGoogle Scholar
  41. Timothy, A.F., Krieger, A.S., Vaiana, G.S.: 1975, Solar Phys. 42, 135. CrossRefADSGoogle Scholar
  42. Toma, G.D., Arge, C.N.: 2005, In: Sankarasubramanian, K., Penn, M., Pevtsov, A. (eds.) Large-scale Structures and Their Role in Solar Activity CS-346, Astron. Soc. Pac., San Francisco, 251. Google Scholar
  43. Vaiana, G.S., Zombeck, M., Krieger, A.S., Timothy, A.F.: 1976, Astrophys. Space Sci. 39, 75. CrossRefADSGoogle Scholar
  44. Wang, Y.M., Sheeley, N.R. Jr.: 1990, Astrophys. J. 355, 726. CrossRefADSGoogle Scholar
  45. Wang, Y.M., Hawley, S.H., Sheeley, N.R. Jr.: 1996, Science 271, 464. CrossRefADSGoogle Scholar
  46. Wiegelmann, T., Solanki, S.K.: 2004, In: Walsh, R.W., Ireland, J., Danesy, D., Fleck, B. (eds.) SOHO 15 Coronal Heating SP-575, ESA, Noordwijk, 35. Google Scholar
  47. Wiegelmann, T., Xia, L.D., Marsch, E.: 2005, Astron. Astrophys. 432, 1. CrossRefADSGoogle Scholar
  48. Wilhelm, K.: 2006, Astron. Astrophys. 455, 697. CrossRefADSGoogle Scholar
  49. Wuelser, J.P., Lemen, J.R., Tarbell, T.D., Wolfson, C.J., Cannon, J.C., Carpenter, B.A., Duncan, D.W., Gradwohl, G.S., Meyer, S.B., Moore, A.S., Navarro, R.L., Pearson, J.D., Rossi, G.R., Springer, L.A., Howard, R.A., Moses, J.D., Newmark, J.S., Delaboudiniere, J.P., Artzner, G.E., Auchere, F., Bougnet, M., Bouyries, P., Bridou, F., Clotaire, J.Y., Colas, G., Delmotte, F., Jerome, A., Lamare, M., Mercier, R., Mullot, M., Ravet, M.F., Song, X., Bothmer, V., Deutsch, W.: 2004, In: Fineschi, S., Gummin, M.A. (eds.) Telescopes and Instrumentation for Solar Astrophysics, Proc. SPIE 5171, 111. Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Astrophysics Research Group, School of PhysicsTrinity College DublinDublin 2Ireland

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