Title: In-depth investigation of the magnetic structure of coronal mass ejections
Other Titles: Diepgaand onderzoek van de magnetische structuur van coronale massaejecties
Authors: Al-haddad, Nada; R0288354
Issue Date: 24-Aug-2015
Abstract: The main problem with understanding and determining the orientation of the magnetic field inside CMEs is that the only measurements we have are single satellite measurements. As a CME passes over a spacecraft, onboard magnetometers measure the time evolution of the three-dimensional magnetic field, yielding a time series of the three components of the field at the location of the spacecraft. Reconstructing the CME's three-dimensional magnetic field is mathematically an ill-posed problem, and must therefore be simplified. All fitting models and reconstruction codes of CMEs, therefore, assume an invariance of the magnetic field property along some axis (straight or curved). This thesis focuses on the validity of this assumption as well as that of an alternative model of a writhed CME. Specifically, our aim is to (i) probe the magnetic structure using the general paradigm of a twisted flux rope; (ii) consider a magnetic field which is writhed rather than twisted; and, (iii) investigate whether a writhed structure fulfills the measured properties typically associated with a twisted flux rope.
Publication status: published
KU Leuven publication type: TH
Appears in Collections:Plasma-astrophysics Section

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