Influence of coronal holes on CME deflections: numerical study

Abstract

The understanding of the causes that produce the deflection of coronal mass ejections (CMEs) is essential for the space weather forecast. In this article, we study the effects on CMEs trajectories produced by the different properties of a coronal hole close to the ejection area. For this analysis, we perform numerical simulations of the ideal magnetohydrodynamics equations that emulate the early rising of the CME in presence of a coronal hole. We find that, the stronger the magnetic field and the wider the coronal hole area, the larger the CME deflection. This effect is reduced when the coronal hole moves away from the ejection region. To characterize this behavior, we propose a dimensionless parameter that depends on the coronal hole properties and properly quantifies the deflection. Also, we show that the presence of the coronal hole near a CME magnetic structure produces a minimum magnetic energy region which is responsible for the deflection. Thus, we find a relationship between the coronal hole properties, the location of this region and the CME deflection.

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Cited by in corpus (8)

• Understanding the deflection of the `Cartwheel CME': data analysis and modeling
• Pseudostreamer influence on flux rope evolution
• Polarity relevance in flux rope deflections triggered by coronal holes
• Coronal dimmings as indicators of early CME propagation direction
• Analysis of solar eruptions deflecting in the low corona: influence of the magnetic environment
• Limb Observations of Global Solar Coronal Extreme-ultraviolet Wavefronts: The Inclination, Kinematics, Coupling with the Expanding Coronal Mass Ejections, and Connection with the Coronal Mass Ejection Driven Shocks
• Early Evolution of Earth-Directed Coronal Mass Ejections in the Vicinity of Coronal Holes
• On the analysis of eruptive events with non-radial evolution