Solar Physics

, Volume 262, Issue 2, pp 425–436 | Cite as

Automated Detection of Filaments and Their Disappearance Using Full-Disc Hα Images

  • A. D. JoshiEmail author
  • N. Srivastava
  • S. K. Mathew
Solar Image Processing and Analysis


A new algorithm is presented that automatically detects filaments on the Sun in full-disc Hα images. Pre-processing of Hα images includes corrections for limb darkening and foreshortening. Further, by applying suitable intensity and size thresholds, filaments are extracted, while other solar features, e.g. sunspots and plages, are removed. Filament attributes such as their position on the solar disc, total area, length, and number of fragments are determined. In addition, every filament is also labelled with a unique number for identification. The algorithm is capable of following a particular filament through successive images, which allows us to detect their changes and disappearance. We have analysed ten cases of filament eruption from different observatories, and the results obtained are presented. The algorithm will eventually be integrated with an upcoming telescope at the Udaipur Solar Observatory for real-time monitoring of activated/eruptive filaments. This aspect should prove to be of particular importance in studies pertaining to space weather.


Prominences, dynamics Prominences, quiescent 


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  1. Ambastha, A., Bhatnagar, A.: 1988, J. Astrophys. Astron. 9, 137. doi: 10.1007/BF02715059. CrossRefADSGoogle Scholar
  2. Bernasconi, P.N., Rust, D.M., Hakim, D.: 2005, Solar Phys. 228, 97. doi: 10.1007/s11207-005-2766-y. CrossRefADSGoogle Scholar
  3. Enger, I., Podsiadlo, R.D., Jensen, D.C., Ward, F.: 1966, Air Force Surv. Geophys. 178. Google Scholar
  4. Filippov, B.P., Den, O.G.: 2001, J. Geophys. Res. 106, 25177. doi: 10.1029/2000JA004002. CrossRefADSGoogle Scholar
  5. Fuller, N., Aboudarham, J., Bentley, R.D.: 2005, Solar Phys. 227, 61. doi: 10.1007/s11207-005-8364-1. CrossRefADSGoogle Scholar
  6. Gao, J., Wang, H., Zhou, M.: 2002, Solar Phys. 205, 93. CrossRefADSGoogle Scholar
  7. Gonzalez, R.C., Woods, R.E.: 2002, Digital Image Processing, Prentice Hall Inc., New Delhi, 668. Google Scholar
  8. Gopalswamy, N., Shimojo, M., Lu, W., Yashiro, S., Shibasaki, K., Howard, R.A.: 2003, Astrophys. J. 586, 562. doi: 10.1086/367614. CrossRefADSGoogle Scholar
  9. Joshi, V., Srivastava, N.: 2007, Bull. Astron. Soc. India 35, 447. MathSciNetADSGoogle Scholar
  10. Lin, Y., Engvold, O., Rouppe van der Voort, L., Wiik, J.E., Berger, T.E.: 2005, Solar Phys. 226, 239. doi: 10.1007/s11207-005-6876-3. CrossRefADSGoogle Scholar
  11. Lin, Y., Engvold, O., Martin, S., Panasenco, O.: 2008, AGU Spring Meeting Abstracts, A5. Google Scholar
  12. Martin, S.F.: 1998, Solar Phys. 182, 107. doi: 10.1023/A:1005026814076. CrossRefADSGoogle Scholar
  13. Martin, S.F., Panasenco, O., Engvold, O., Lin, Y.: 2008, Ann. Geophys. 26, 3061. ADSCrossRefGoogle Scholar
  14. Mathew, S.K., Martínez Pillet, V., Solanki, S.K., Krivova, N.A.: 2007, Astron. Astrophys. 465, 291. doi: 10.1051/0004-6361:20066356. CrossRefADSGoogle Scholar
  15. Neckel, H., Labs, D.: 1994, Solar Phys. 153, 91. doi: 10.1007/BF00712494. CrossRefADSGoogle Scholar
  16. Pierce, A.K., Slaughter, C.D.: 1977, Solar Phys. 51, 25. doi: 10.1007/BF00240442. CrossRefADSGoogle Scholar
  17. Qu, M., Shih, F.Y., Jing, J., Wang, H.: 2005, Solar Phys. 228, 119. doi: 10.1007/s11207-005-5780-1. CrossRefADSGoogle Scholar
  18. Robbrecht, E., Berghmans, D., Van der Linden, R.A.M.: 2009, Astrophys. J. 691, 1 222. doi: 10.1088/0004-637X/691/2/1222. CrossRefADSGoogle Scholar
  19. Schmieder, B., van Driel-Gesztelyi, L., Aulanier, G., Démoulin, P., Thompson, B., De Forest, C., Wiik, J.E., St. Cyr, C., Vial, J.C.: 2002, Adv. Space Res. 29, 1451. doi: 10.1016/S0273-1177(02)00211-9. CrossRefADSGoogle Scholar
  20. Shih, F.Y., Kowalski, A.J.: 2003, Solar Phys. 218, 99. doi: 10.1023/B:SOLA.0000013052.34180.58. CrossRefADSGoogle Scholar
  21. Srivastava, N., Venkatakrishnan, P.: 2004, J. Geophys. Res. 109, 10103. doi: 10.1029/2003JA010175. CrossRefGoogle Scholar
  22. Zharkova, V.V., Schetinin, V.: 2005, Solar Phys. 228, 137. doi: 10.1007/s11207-005-5622-1. CrossRefADSGoogle Scholar
  23. Zirin, H.: 1979, In: Physics of Solar Prominences, 193. Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Udaipur Solar ObservatoryPhysical Research LaboratoryUdaipurIndia

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