Study of Limb CMEs during Solar Cycle 23

G. Munoz-Martinez1,2, A. Gonzalez-Fajardo3, V. Aguilera3

1Escuela Superior de Ingenieria Mecanica y Electrica Zacatenco, IPN, Mexico
2Escuela Superior de Fysica y Matematicas, IPN, Mexico

Limb CMEs are of special interest due to the preferential location related to the observer. Dynamical parameters are less affected by projection effects than at any other position and speed and opening angle can be determined in a good approximation to the actual values. We selected limb CMEs by searching for flares on the limb in EIT images and identified related CMEs. For them we evaluated plane of the sky speed, expansion speed and radial speed in order to study the relation among them. We found that radial speed is related to expansion speed depending on the opening angle. We compared average plane of the sky speed of limb CMEs and the average of the total sample to evaluate projection effects.