Solar Physics

, Volume 257, Issue 1, pp 125–147 | Cite as

The ARTEMIS Catalog of LASCO Coronal Mass Ejections

Automatic Recognition of Transient Events and Marseille Inventory from Synoptic maps
  • Y. Boursier
  • P. Lamy
  • A. Llebaria
  • F. Goudail
  • S. Robelus
Article
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Abstract

The LASCO-C2 coronagraph aboard the SOHO solar observatory has been providing a continuous flow of coronal images since 1996. Synoptic maps for each Carrington rotation have been built from these images, and offer a global view of the temporal evolution of the solar corona, particularly the occurrence of transient events. Coronal Mass Ejections (CMEs) present distinct signatures thus offering a novel approach to the problem of their identification and characterization. We present in this article an automated method of detection based on their morphological appearance on synoptic maps. It is based on adaptive filtering and segmentation, followed by merging with high-level knowledge. The program builds a catalog which lists the CMEs detected for each Carrington Rotation, together with their main estimated parameters: time of appearance, position angle, angular extent, average velocity and intensity. Our final catalog LASCO-ARTEMIS (Automatic Recognition of Transient Events and Marseille Inventory from Synoptic maps) is compared with existing catalogs, CDAW, CACTUS and SEEDS. We find that, likewise the automated CACTUS and SEEDS catalogs, we detect many more events than the CDAW catalog which is based on visual detection. The total number of detected CMEs strongly depends upon the sensitivity to small, faint and numerous events.

Keywords

Automated detection Corona Coronal Mass Ejections Synoptic maps 
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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Y. Boursier
    • 1
  • P. Lamy
    • 1
  • A. Llebaria
    • 1
  • F. Goudail
    • 2
  • S. Robelus
    • 1
  1. 1.Laboratoire d’Astrophysique de Marseille UMR 6110, CNRS/Université de ProvenceTechnopôle de Marseille-EtoileMarseille cedex 13France
  2. 2.Laboratoire Charles Fabry de l’Institut d’OptiqueCNRS/Université Paris-SudPalaiseauFrance

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