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Solar Source and CME Properties of Solar Cycle 23 Ground Level Enhancement EventsSolar cycle 23 witnessed the most complete set of observations of coronal mass ejections (CMEs) associated with the Ground Level Enhancement (GLE) events. GLE events are extreme cases of solar energetic particle (SEP) events in that the energetic particles penetrate Earth's neutral atmosphere to be detected by neutron monitors. In this paper we present the CME and their source properties that seem to be equally extreme. These observations are consistent with the idea that the GLE particles are accelerated in the same way as the regular SEP events by CME-driven shocks. While we cannot rule out the possibility of the presence of a flare component during GLE events, we can definitely say that a shock component is present in all the GLE events. We provide additional information on the GLE-associated type II radio bursts, complex type III radio bursts, and soft X-ray flares, which are not very different from those associated with large SEP events. Finally we compare the properties of GLEassociated CMEs in cycle 23 with those in cycle 22.
Document ID
20100031232
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Gopalswamy, Nat
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Xie, H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yashiro, S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Akiyama, S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Makela, P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Usoskin, I.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
August 8, 2010
Subject Category
Solar Physics
Meeting Information
Meeting: 2010 Meeting of the Americas
Location: Foz do Iguacu
Country: Brazil
Start Date: August 8, 2010
End Date: August 13, 2010
Distribution Limits
Public
Copyright
Other

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