Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13b1530k&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13B-1530
Physics
7509 Corona, 7513 Coronal Mass Ejections (2101)
Scientific paper
The SECCHI observations provide an unprecedented view of the acceleration and propagation of CMEs in the corona and the heliosphere. The LASCO observations of the past 10 years have established that most, if not all, CMEs can be understood as expanding magnetic flux ropes. It has been shown that the observed dynamics in this regime can be correctly replicated by the erupting flux-rope model. We extend the application of this theoretical model to the new SECCHI EUVI, COR-1, COR-2, and HI-1 observations of CMEs and their dynamics, which can be measured out to about 100 Rs projected. Four observed flux-rope CMEs are discussed. We calculate the forces from various contributions acting on these CMEs. It is shown that the erupting flux-rope model is able to fit the observed CME trajectories throughout the EUVI-COR1-COR2-HI1 field of view. This indicates that the model correctly captures the basic physics, i.e., forces and magnetic geometry, of acceleration and propagation of CMEs. It is found that significantly larger values of the drag coefficient in the model than previously used are required to fit both the COR-1/COR-2 data and HI-1 data. The new expanded field of view of SECCHI imposes stronger constraints on model parameters than does the previous LASCO data set. Work supported by ONR and NASA
Chen Jiahua
Kunkel Valbona
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