Space Weather Application Using Projected Velocity Asymmetry of Halo CMEs

Abstract

Halo coronal mass ejections (HCMEs) originating from regions close to the center of the Sun are likely to be responsible for severe geomagnetic storms. It is important to predict geo-effectiveness of HCMEs using observations when they are still near the Sun. Unfortunately, coronagraphic observations do not provide true speeds of CMEs due to the projection effects. In the present paper, we present a new technique allowing estimate the space speed and approximate source location using projected speeds measured at different position angles for a given HCME (velocity asymmetry). We apply this technique to HCMEs observed during 2001-2002 and find that the improved speeds are better correlated with the travel times of HCMEs to Earth and with the magnitudes ensuing geomagnetic storms.

accepted for [publication in Solar Physics

References in corpus (3)

• A new possibility to estimate the width, source location and velocity of halo CMEs
• An Asymmetric Cone Model for Halo Coronal Mass Ejections
• Prediction Space Weather Using an Asymmetric Cone Model for Halo CMEs

Cited by in corpus (3)

• Magnetic Flux of EUV Arcade and Dimming Regions as a Relevant Parameter for Early Diagnostics of Solar Eruptions - Sources of Non-Recurrent Geomagnetic Storms and Forbush Decreases
• Coronal Mass Ejection Detection using Wavelets, Curvelets and Ridgelets: Applications for Space Weather Monitoring
• On the Relationship Between Transit Time of ICMEs and Strength of the Initiated Geomagnetic Storms