Deriving the Near-Sun Magnetic Field of Coronal Mass Ejections from Magnetic Helicity Conservation
Abstract
The near-Sun magnetic field of Coronal Mass Ejections represents a key parameter for assessing their energetics and structuring, and additionally, it is a major element of methods/applications/simulations aiming to predict the magnetic field of Earth-directed CMEs upon impact at geospace. Diagnostics of CME magnetic fields in the corona can be achieved via observations in the radio domain, which however, are currently not available on a regular basis. Therefore, several methods to infer the CME magnetic field in the corona have recently emerged. We developed one such method which is based on the magnetic helicity conservation principle applied to flux rope CMEs. Its input parameters could be readily retrieved from the analysis of HMI magnetograms and SOHO/STEREO WL coronagraph images. We present parametric and case-study applications of this method, and discuss how it be could be used to predict the CME magnetic field magnitude at 1 AU.
- Publication:
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Solar Heliospheric and INterplanetary Environment (SHINE 2019)
- Pub Date:
- May 2019
- Bibcode:
- 2019shin.confE.222P