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| Titel |
A comparison of coronal mass ejections identified by manual and automatic methods |
| VerfasserIn |
S. Yashiro, G. Michałek, N. Gopalswamy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 10 ; Nr. 26, no. 10 (2008-10-15), S.3103-3112 |
| Datensatznummer |
250016257
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3103-2008.pdf |
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| Zusammenfassung |
| Coronal mass ejections (CMEs) are related to many phenomena (e.g. flares,
solar energetic particles, geomagnetic storms), thus compiling of event
catalogs is important for a global understanding these phenomena. CMEs have
been identified manually for a long time, but in the SOHO era, automatic
identification methods are being developed. In order to clarify the
advantage and disadvantage of the manual and automatic CME catalogs, we
examined the distributions of CME properties listed in the CDAW (manual) and
CACTus (automatic) catalogs. Both catalogs have a good agreement on the wide
CMEs (width>120°) in their properties, while there is a significant
discrepancy on the narrow CMEs (width≤30°): CACTus has a larger number
of narrow CMEs than CDAW. We carried out an event-by-event examination of a
sample of events and found that the CDAW catalog have missed many narrow
CMEs during the solar maximum. Another significant discrepancy was found on
the fast CMEs (speed>1000 km/s): the majority of the fast CDAW CMEs are
wide and originate from low latitudes, while the fast CACTus CMEs are narrow
and originate from all latitudes. Event-by-event examination of a sample of
events suggests that CACTus has a problem on the detection of the fast CMEs. |
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