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Homologous solar events on 2011 January 27: Build-up and propagation in a complex coronal environment View all abstracts by submitter

Pascal Demoulin   Submitted: 2016-03-11 09:14

In spite of the wealth of imaging observations at extreme-ultraviolet, X-ray, and radio wavelengths, there are still a relatively small number of cases where the whole imagery becomes available to study the full development of a coronal mass ejection (CME) event and its associated shock. The aim of this study is to contribute to the understanding of the role of the coronal environment in the development of CMEs and formation of shocks, and on their propagation. We have analyzed the interactions of a couple of homologous CME events with the ambient coronal structures. Both events were launched in a direction far from the local vertical, and exhibited a radical change of their direction of propagation during their progression from the low corona into higher altitudes. Observations at extreme ultraviolet wavelengths from the Atmospheric Imaging Assembly instrument onboard the Solar Dynamic Observatory were used to track the events in the low corona. The development of the events at higher altitudes was followed with the white light coronagraphs onboard the Solar and Heliospheric Observatory. Radio emissions produced during the development of the events were well recorded by the Nançay solar instruments. By detecting accelerated electrons, the radio observations are an important complement to the extreme ultraviolet imaging. They allowed us to characterize the development of the associated shocks, and helped unveil the physical processes behind the complex interactions between the CMEs and ambient medium (e.g., compression, reconnection).

Authors: M. Pick, G. Stenborg, P. Demoulin, P. Zucca, A. Lecacheux
Projects: Nançay Radioheliograph

Publication Status: ApJ, in press
Last Modified: 2016-03-15 11:25
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