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Near-Sun Speed of CMEs and the Magnetic Non-potentiality of their Source Active Regions View all abstracts by submitter

Sanjiv Tiwari   Submitted: 2015-08-05 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 AR-integrated magnetic parameters (AR magnetic flux, three different AR magnetic-twist parameters, and six AR free-magnetic-energy 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 whole-AR magnetic parameters, and (2) that one of the AR magnetic-twist parameters and the corresponding free-magnetic-energy proxy each determine the CME-speed upper-limit line somewhat better than any of the other eight whole-AR magnetic parameters.

Authors: Sanjiv K. Tiwari, David A. Falconer, Ronald L. Moore, P. Venkatakrishnan, Amy R. Winebarger, Igor G. Khazanov
Projects: SDO-HMI

Publication Status: Published in GRL
Last Modified: 2015-08-06 08:46
Go to main E-Print page  Low frequency radio observations of bi-directional electron beams in the solar corona  Evidence of Twisted flux-tube Emergence in Active Regions  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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