Influence of coronal holes on CME deflections: numerical study

SAHADE, A.; CÉCERE, M.; KRAUSE, G.

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2020

0004-637X

The understanding of the causes that produce the deflection of coronal massejections (CMEs) is essential for the space weather forecast. In this article,we study the effects on CMEs trajectories produced by the different propertiesof a coronal hole close to the ejection area. For this analysis, we performnumerical simulations of the ideal magnetohydrodynamics equations that emulatethe early rising of the CME in presence of a coronal hole. We find that, thestronger the magnetic field and the wider the coronal hole area, the larger theCME deflection. This effect is reduced when the coronal hole moves away fromthe ejection region. To characterize this behavior, we propose a dimensionlessparameter that depends on the coronal hole properties and properly quantifiesthe deflection. Also, we show that the presence of the coronal hole near a CMEmagnetic structure produces a minimum magnetic energy region which isresponsible for the deflection. Thus, we find a relationship between thecoronal hole properties, the location of this region and the CME deflection.