Statistical Study of False Alarms of Geomagnetic Storms

Kristoffer Leer, Susanne Vennerstrøm, A. Veronig, L. Rodriguez, B. Vrsnak, M. Dumbovic

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    Abstract

    Coronal Mass Ejections (CMEs) are known to cause geomagnetic storms on Earth. However, not all CMEs will trigger geomagnetic storms, even if they are heading towards the Earth. In this study, front side halo CMEs with speed larger than 500 km/s have been identified from the SOHO LASCO catalogue. A subset of these halo CMEs did not cause a geomagnetic storm the following four days and have therefore been considered as false alarms. The properties of these events are investigated and discussed here. Their statistics are compared to the geo-effective CMEs.
    The ability to identify potential false alarms is considered as an important factor when forecasting geomagnetic storms. It would therefore be very helpful if there were a signature in the solar data that could indicate that a CME is a false alarm. The strength and position of associated flares have been considered as possible candidates for false alarm signature
    Original languageEnglish
    Publication date2013
    Number of pages1
    Publication statusPublished - 2013
    Event10th European Space Weather Week - Antwerp, Belgium
    Duration: 18 Nov 201322 Nov 2013
    Conference number: 10

    Conference

    Conference10th European Space Weather Week
    Number10
    Country/TerritoryBelgium
    CityAntwerp
    Period18/11/201322/11/2013

    Bibliographical note

    Talk at conference

    This work has received funding from the European Commission FP7 Project COMESEP (263252).

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