The orientation of flux rope CMEs from the corona to 1 AU

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dc.contributor Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Fysiikan laitos fi
dc.contributor University of Helsinki, Faculty of Science, Department of Physics en
dc.contributor Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten, Institutionen för fysik sv Käki, Sebastian 2015
dc.identifier.uri URN:NBN:fi-fe2017112251936
dc.description.abstract Coronal mass ejections (CMEs) are ejections of plasma and magnetic flux from the Sun. These eruptions are large in size and they propagate over large distances in the heliosphere. If a CME is directed towards the Earth it can cause major space weather disturbances. Thus it is important to know whether a CME will hit the magnetosphere of the Earth and what kind of disturbances it could cause. CMEs contain large-scale twisted magnetic fields called flux ropes. Information about the orientation and the structure of the flux rope is crucial in determining its space weather effects. This thesis is focused on the determination of the orientation and the direction of flux rope CMEs from the corona all the way to the orbit of the Earth. An overview of a number of methods to obtain the necessary flux rope parameters both from remote sensing and in situ measurements is given. In particular, a technique combining the remote and in situ observations with a Sun-to-Earth propagation model for the CME is described in detail. In this thesis, the technique is used to study the propagation of a slow and a fast CME and the results are compared with each other and with earlier studies on the subject. The direction and amount of deflections and rotation were found to be consistent with the earlier results. In addition, differences in the proportional deflections before and after 20 Solar radii with respect to the total deflections were found between the fast and the slow case. en
dc.language.iso en
dc.publisher Helsingfors universitet sv
dc.publisher University of Helsinki en
dc.publisher Helsingin yliopisto fi
dc.title The orientation of flux rope CMEs from the corona to 1 AU en
dc.type.ontasot pro gradu-avhandlingar sv
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.subject.discipline Theoretical Physics en
dc.subject.discipline Teoreettinen fysiikka fi
dc.subject.discipline Teoretisk fysik sv
dct.identifier.urn URN:NBN:fi-fe2017112251936


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