Observational Characteristics of CMEs without Low Coronal Signatures

Abstract

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

42 pages, 10 figures

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• Torus instability
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• Investigating Remote-sensing Techniques to Reveal Stealth Coronal Mass Ejections
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• Determining the source and eruption dynamics of a stealth CME using NLFFF modelling and MHD simulations
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• Sun-to-Earth Observations and Characteristics of Isolated Earth-Impacting Interplanetary Coronal Mass Ejections During 2008-2014
• Inter-planetary type-IV solar radio bursts: A comprehensive catalog and statistical results
• Understanding the Origins of Problem Geomagnetic Storms Associated With "Stealth" Coronal Mass Ejections
• Is there a Dynamic Difference between Stealthy and Standard CMEs?
• Characterising Solar Magnetic Reconnection in Confined and Eruptive Flares
• Numerical simulations of shear-induced consecutive coronal mass ejections
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