Is there a Dynamic Difference between Stealthy and Standard CMEs? by Beili Ying et al. on Thursday 24 November

Stealthy Coronal Mass Ejections (CMEs), lacking low coronal signatures, may

result in significant geomagnetic storms. However, the mechanism of stealthy

CMEs is still highly debated. In this work, we investigate whether there are

differences between the stealthy and standard CMEs in terms of their dynamic

behaviors. Seven stealthy and eight standard CMEs with slow speeds are

selected. We calculate two-dimensional speed distributions of CMEs based on the

cross-correlation method, rather than the unidimensional speed, and further

obtain more accurate distributions and evolution of CME mechanical energies.

Then we derive the CME driving powers and correlate them with CME parameters

(total mass, average speed, and acceleration) for standard and stealthy CMEs.

Besides, we study the forces that drive CMEs, namely, the Lorentz force,

gravitational force, and drag force due to the ambient solar wind near the Sun.

The results reveal that both the standard and stealthy CMEs are propelled by

the combined action of those forces in the inner corona. The drag force and

gravitational force are comparable with the Lorentz force. However, the impact

of the drag and Lorentz forces on the global evolution of the stealthy CMEs is

significantly weaker than that of the standard CMEs.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12825v1