NearSun Speed of CMEs and the Magnetic Nonpotentiality of their Source Active Regions 

Sanjiv Tiwari Submitted: 20150805 13:14
We show that the speed of the fastest coronal mass ejections (CMEs) that an active region (AR) can produce can be predicted from a vector magnetogram of the AR. This is shown by logarithmic plots of CME speed (from the SOHO LASCO CME catalog) versus each of ten ARintegrated magnetic parameters (AR magnetic flux, three different AR magnetictwist parameters, and six AR freemagneticenergy proxies) measured from the vertical and horizontal field components of vector magnetograms (from the Solar Dynamics Observatory's Helioseismic and Magnetic Imager) of the source ARs of 189 CMEs. These plots show: (1) the speed of the fastest CMEs that an AR can produce increases with each of these wholeAR magnetic parameters, and (2) that one of the AR magnetictwist parameters and the corresponding freemagneticenergy proxy each determine the CMEspeed upperlimit line somewhat better than any of the other eight wholeAR magnetic parameters.
Authors: Sanjiv K. Tiwari, David A. Falconer, Ronald L. Moore, P. Venkatakrishnan, Amy R. Winebarger, Igor G. Khazanov
Projects: SDOHMI

Publication Status: Published in GRL
Last Modified: 20150806 08:46


