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Solar eruptions are usually associated with a variety of phenomena occurringin the low corona before, during, and after onset of eruption. Though easilyvisible in coronagraph observations, so-called stealth coronal mass ejections(CMEs) do not obviously exhibit any of these low-coronal signatures. Thepresence or absence of distinct low coronal signatures can be linked todifferent theoretical models to establish the mechanisms by which the eruptionis initiated and driven. In this study, 40 CMEs without low coronal signatures,occurring in 2012, are identified. Their observational and kinematic propertiesare analyzed and compared to those of regular CMEs. Solar eruptions withoutclear on-disk or low coronal signatures can lead to unexpected space weatherimpacts, since many early warning signs for significant space weather activityare not present in these events. A better understanding of their initiationmechanism(s) will considerably improve the ability to predict such spaceweather events.

Observational Characteristics of CMEs without Low Coronal Signatures