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Self-similar expansion of solar coronal mass ejections: implications for Lorentz self-force driving View all abstracts by submitter

Prasad Subramanian   Submitted: 2014-06-03 00:24

We examine the propagation of several CMEs with well-observed flux rope signatures in the field of view of the SECCHI coronagraphs aboard the STEREO satellites using the GCS fitting method of Thernisien, Vourlidas & Howard (2009). We find that the manner in which they propagate is approximately self-similar; i.e., the ratio (\kappa) of the flux rope minor radius to its major radius remains approximately constant with time. We use this observation of self-similarity to draw conclusions regarding the local pitch angle (\gamma) of the flux rope magnetic field and the misalignment angle (χ) between the current density {\mathbf J} and the magnetic field {\mathbf B}. Our results suggest that the magnetic field and current configurations inside flux ropes deviate substantially from a force-free state in typical coronagraph fields of view, validating the idea of CMEs being driven by Lorentz self-forces.

Authors: Prasad Subramanian, K. P. Arunbabu, Angelos Vourlidas, Adwiteey Mauriya
Projects: STEREO

Publication Status: Accepted, ApJ
Last Modified: 2014-06-04 13:45
Go to main E-Print page  Magnetohydrodynamic Simulation of the X2.2 Solar Flare on 2011 February 15. I. Comparison with the Observations  Mean-field dynamo action from delayed transport  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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