Solar Physics

, Volume 228, Issue 1–2, pp 55–66 | Cite as

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

  • R. T. James McAteerEmail author
  • Peter T. Gallagher
  • Jack Ireland
  • C. Alex Young


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.


Flare Active Region Technique Apply Solar Disc Separate Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • R. T. James McAteer
    • 1
    Email author
  • 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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