Document detailsTitle: CACTUS: Long-term properties of CMEs
Authors: BERGHMANS, D. (ROB); ROBBRECHT, E. (NRL); VAN DER LINDEN, R. (ROB)
Presentation from the Space Climate Symposium 3 (Finland, March 2009)
The LASCO coronagraphs onboard SOHO have systematically observed coronal mass ejections throughout solar cycle 23. Many thousands of events have been witnessed in variable coronal configurations from solar minimum to solar maximum and back. For the first time in history, data is now available to statiscally study this evolution of CME characteristics along a full solar cycle. However, such long term studies require to extract the CMEs using a fixed definition of the criteria which the candidate event should fulfill in order to be classified as CME. We have developed the computer program "CACTus" (Computer Aided CME Tracking) that scans systematically the many thousands of LASCO images and produces consistent CME lists. CACTus runs in an operational way and its realtime output are available at http://sidc.be/cactus. We present a statistical analysis of a CME list produced by CACTus covering a full solar cycle. We will point out important differences exist between CME statistics produced by human inspection at one hand and by computer codes such as CACTus and others at the other hand. These differences bring us to new insights in what CMEs are and their relevance to the heliospheric climate.
Insert date: 2009 Jun 5
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File: 20090320_Finland_cactus.pdf (4270 KB)