Advertisement

Solar Physics

, Volume 248, Issue 2, pp 457–469 | Cite as

Multiscale Edge Detection in the Corona

  • C. Alex YoungEmail author
  • Peter T. Gallagher
Article

Abstract

Coronal Mass Ejections (CMEs) are challenging objects to detect using automated techniques, due to their high velocity and diffuse, irregular morphology. A necessary step to automating the detection process is to first remove the subjectivity introduced by the observer used in the current, standard, CME detection and tracking method. Here we describe and demonstrate a multiscale edge detection technique that addresses this step and could serve as one part of an automated CME detection system. This method provides a way to objectively define a CME front with associated error estimates. These fronts can then be used to extract CME morphology and kinematics. We apply this technique to a CME observed on 18 April 2000 by the Large Angle Solar COronagraph experiment (LASCO) C2/C3 and a CME observed on 21 April 2002 by LASCO C2/C3 and the Transition Region and Coronal Explorer (TRACE). For the two examples in this work, the heights determined by the standard manual method are larger than those determined with the multiscale method by ≈10% using LASCO data and ≈20% using TRACE data.

Keywords

Sun: corona Sun: coronal mass ejections (CMEs) Techniques: image processing 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Boursier, Y., Llebaria, A., Goudail, F., Lamy, P., Robelus, S.: 2005, Automatic detection of coronal mass ejections on LASCO-C2 synoptic maps. SPIE 5901, 13 – 24. ADSGoogle Scholar
  2. Brueckner, G.E., Howard, R.A., Koomen, M.J., Korendyke, C.M., Michels, D.J., Moses, J.D., Socker, D.G., Dere, K.P., Lamy, P.L., Llebaria, A., Bout, M.V., Schwenn, R., Simnett, G.M., Bedford, D.K., Eyles, C.J.: 1995, The large angle spectroscopic coronagraph (LASCO). Solar Phys. 162, 357 – 402. CrossRefADSGoogle Scholar
  3. Canny, J.: 1986, A computational approach to edge detection. IEEE Trans. Pattern Recognit. Mach. Intell. 8, 679 – 698. CrossRefGoogle Scholar
  4. Efron, S., Tibshirani, R.J.: 1993, An Introduction to the Bootstrap, Chapman and Hall, New York. zbMATHGoogle Scholar
  5. Gallagher, P.T., Lawrence, G.R., Dennis, B.R.: 2003, Rapid acceleration of a coronal mass ejection in the low corona and implications for propagation. Astrophys. J. 588, L53 – L56. CrossRefADSGoogle Scholar
  6. Gallagher, P.T., Dennis, B.R., Krucker, S., Schwartz, R.A., Tolbert, A.K.: 2002, RHESSI and TRACE observations of the 21 April 2002 X1.5 flare. Solar Phys. 210, 341 – 356. CrossRefADSGoogle Scholar
  7. Gonzalez, R.C., Woods, R.E.: 2002, Digital Image Processing, 2nd edn., Prentice-Hall, Upper Sadle River. Google Scholar
  8. Handy, B.N., Acton, L.W., Kankelborg, C.C., Wolfson, C.J., Akin, D.J., Bruner, M.E., Caravalho, R., Catura, R.C., Chevalier, R., Duncan, D.W., Edwards, C.G., Feinstein, C.N., Freeland, S.L., Friedlaender, F.M., Hoffmann, C.H., Hurlburt, N.E., Jurcevich, B.K., Katz, N.L., Kelly, G.A., Lemen, J.R., Levay, M., Lindgren, R.W., Mathur, D.P., Meyer, S.B., Morrison, S.J., Morrison, M.D., Nightingale, R.W., Pope, T.P., Rehse, R.A., Schrijver, C.J., Shine, R.A., Shing, L., Strong, K.T., Tarbell, T.D., Title, A.M., Torgerson, D.D., Golub, L., Bookbinder, J.A., Caldwell, D., Cheimets, P.N., Davis, W.N., Deluca, E.E., McMullen, R.A., Warren, H.P., Amato, D., Fisher, R., Maldonado, H., Parkinson, C.: 1999, The transition region and coronal explorer. Solar Phys. 187, 229 – 260. CrossRefADSGoogle Scholar
  9. Mallat, S.: 1998, A Wavelet Tour of Signal Processing, Academic, San Diego. zbMATHGoogle Scholar
  10. Mallat, S., Hwang, W.L.: 1992, Singularity detection and processing with wavelets. IEEE Trans. Inf. Theory 38, 617 – 643. CrossRefMathSciNetGoogle Scholar
  11. Mallat, S., Zhong, S.: 1992, Characterization of signals from multiscale edges. IEEE Trans. Pattern Anal. Mach. Intell. 14, 710 – 732. CrossRefGoogle Scholar
  12. Marr, D.: 1982, Vision, W.H. Freeman, New York. Google Scholar
  13. Olmedo, O., Zhang, J., Wechsler, H., Borne, K., Poland, A.: 2005, Solar eruptive event detection system (SEEDS). Bull. Am. Astron. Soc. 37, 1342. ADSGoogle Scholar
  14. Portier-Fozzani, F., Vandame, B., Bijaoui, A., Maucherat, A.J.: 2001, A multiscale vision model applied to analyze EIT images of the solar corona. Solar Phys. 201, 271 – 287. CrossRefADSGoogle Scholar
  15. Qu, M., Shih, F.Y., Jing, J., Wang, H.: 2006, Automatic detection and classification of coronal mass ejections. Solar Phys. 237, 419 – 431. CrossRefADSGoogle Scholar
  16. Robbrecht, E., Berghmans, D.: 2004, Automated recognition of coronal mass ejections (CMEs) in near-real-time data. Astron. Astrophys. 425, 1097 – 1106. CrossRefADSGoogle Scholar
  17. Starck, J.-L., Murtagh, F.: 2002, Handbook of Astronomical Data Analysis, Springer, Berlin. Google Scholar
  18. Stenborg, G., Cobelli, P.J.: 2003, A wavelet packets equalization technique to reveal the multiple spatial-scale nature of coronal structures. Astron. Astrophys. 398, 1185 – 1193. CrossRefADSGoogle Scholar
  19. Yashiro, S., Gopalswamy, N., Michalek, G., St. Cyr, O.C., Plunkett, S.P., Rich, N.B., Howard, R.A.: 2004, A catalog of white light coronal mass ejections observed by the SOHO spacecraft. J. Geophys. Res. 109(A7), A07105. CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.ADNET Systems Inc., NASA/GSFCGreenbeltUSA
  2. 2.Astrophysics Research Group, School of PhysicsTrinity College DublinDublin 2Ireland

Personalised recommendations