Solar Physics

, Volume 228, Issue 1–2, pp 55–66

Automated Boundary-extraction And Region-growing Techniques Applied To Solar Magnetograms

  • R. T. James McAteer
  • Peter T. Gallagher
  • Jack Ireland
  • C. Alex Young
Article

Abstract

We present an automated approach to active region extraction from full-disc MDI longitudinal magnetograms. This uses a region-growing technique in conjunction with boundary-extraction to define a number of enclosed contours as belonging to separate regions of magnetic significance on the solar disc. This provides an objective definition of active regions and areas of plage on the Sun. A number of parameters relating to the flare potential of each region are discussed.

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References

  1. Abramenko, V. I., Yurchyshyn, V. B., Wang, H., Spirock, T. J., and Goode, P. R.: 2003, Astrophys. J. 597, 1135.CrossRefADSGoogle Scholar
  2. Berger, T. and Lites, B. W.: 2003, Solar Phys. 213, 213.CrossRefADSGoogle Scholar
  3. Bratsolis, E. and Sigelle, M.: 1998, Astron. Astrophys. Suppl. Ser. 131, 371.CrossRefADSGoogle Scholar
  4. Bugayevskiy, L. M. and Snyder, J. P.: 1995, Map Projections A Reference Manual, Taylor & Francis, Inc., Philadelphia.Google Scholar
  5. DeForest, C. E.: 2004, Solar Phys. 219, 3.CrossRefADSGoogle Scholar
  6. Domingo, V., Fleck, B., and Poland, A. I.: 1995, Solar Phys. 162, 1.CrossRefADSGoogle Scholar
  7. Gallagher, P. T., Moon, Y.-J., and Wang, H.: 2002, Solar Phys. 209, 171.CrossRefADSGoogle Scholar
  8. Gonzales, R. C. and Woods, R. E.: 2002, Digital Image Processing, 2nd ed. Prentice-Hall Inc., New Jersey.Google Scholar
  9. Green, L. M., Demoulin, P., Mandrini, C. H., and van Driel-Gesztelyi, L.: 2003, Solar Phys. 215, 307.CrossRefADSGoogle Scholar
  10. Lawrence, J. K., Ruzmaikin, A. A., and Cadavid, A. C.: 1996, Astrophys. J. 465, 425.CrossRefADSGoogle Scholar
  11. Lu, E. T.: 1995, Astrophys. J. 446, L109.CrossRefADSGoogle Scholar
  12. McAteer, R. T. J., Gallagher, P. T., and Ireland, J.: 2005, Astrophys. J. (in press).Google Scholar
  13. Muenier, N.: 1999, Astrophys. J. 515, 801.ADSGoogle Scholar
  14. Nguyen, T. T., Willis, C. P., Paddon, D. P., and Nguyen, H. S.: 2004, In Intelligent Information Systems 59 (in press).Google Scholar
  15. Pap, J. M., Turmon, M., Mukhtar, S., Bogart, R., Ulrich, R., Fröhlich, C., and Wehrli, Ch.: 1997, In Correlated Phenomena at the Sun, in the Heliosphere and in Geospace, Proceedings of 31st ESLAB Symposium, ESA-SP 415, 477.Google Scholar
  16. Qu, M., Shih, F., Jing, J., and Wang, H.: 2004, Solar Phys. 222, 137.CrossRefADSGoogle Scholar
  17. Scherrer, P. H., et al.: 1995, Solar Phys. 162, 129.CrossRefADSGoogle Scholar
  18. Snyder, J. P.: 1993, Flattening the Earth: Two Thousand Years of Map Projections, The University of Chicago Press, Ltd., London.Google Scholar
  19. Verwichte, E.: 2003, in A. Wilson (ed.), Solar Variability as an Input to the Earth's Environment, International Solar Cycle Studies Symposium, ESA-SP 535, 169.Google Scholar
  20. Vlahos, L. and Georgoulis, M. K.: 2004, Astrophys. J. 603, L61.CrossRefADSGoogle Scholar
  21. Worden, J. R., White, O. R., and Woods, T. N.: 1998, Astrophys. J. 496, 998.CrossRefADSGoogle Scholar
  22. Zharkova, V., Ipson, S., Benkhalil A., and Zharkov, S.: 2005, Artif. Intell. J. (in press).Google Scholar

Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • R. T. James McAteer
    • 1
  • Peter T. Gallagher
    • 2
  • Jack Ireland
    • 3
  • C. Alex Young
    • 3
  1. 1.National Research Council Research AssociateNASA Goddard Space Flight CenterGreenbeltU.S.A.
  2. 2.Department of Experimental PhysicsUniversity College DublinIreland
  3. 3.L-3 Communications GSINASA Goddard Space Flight CenterGreenbeltU.S.A.

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