The Kinematics of CMEs using Multiscale Methods
Byrne Jason, Trinity College Dublin
Gallagher, P.T., McAteer, R.T.J., Young, C.A.
Trinity College Dublin; ADNET Inc. NASA/GSFC
| Our aim is to produce computationally fast methods for extracting the kinematics of CMEs, through methods of multiscale analysis and characterisation. The transient nature of CMEs means traditional image analysis can be difficult to interpret. However, we propose exploiting the multiscale dependence of the CME data in order to extract structure in a manner of multiscale decomposition, akin to a Canny edge detector. This highlights the CME front as it propagates in time, allowing for characterisation and analysis. Here we describe these methods, and use them to study the multiscale properties of CMEs observed by SOHO/LASCO. We apply an ellipse characterisation to extract the kinematics (height, velocity, acceleration) and changing morphology (width, orientation), and briefly discuss the implications for future automated detection. The height-time curves of certain CMEs are shown to differ from the CDAW catalog online, and even in some cases to exhibit non-constant acceleration profiles. |