Self-Similarity of ICME Flux Ropes : Observations by Radially Aligned Spacecraft in the Inner Heliosphere

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http://hdl.handle.net/10138/305566

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Good , S W , Kilpua , E K J , LaMoury , A T , Forsyth , R J , Eastwood , J P & Möstl , C 2019 , ' Self-Similarity of ICME Flux Ropes : Observations by Radially Aligned Spacecraft in the Inner Heliosphere ' , Journal of geophysical research. Space physics , vol. 124 , no. 7 , pp. 4960-4982 . https://doi.org/10.1029/2019JA026475

Title: Self-Similarity of ICME Flux Ropes : Observations by Radially Aligned Spacecraft in the Inner Heliosphere
Author: Good, S.W.; Kilpua, E.K.J.; LaMoury, A.T.; Forsyth, R.J.; Eastwood, J.P.; Möstl, C.
Contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Space Physics Research Group
Date: 2019-07
Language: eng
Number of pages: 23
Belongs to series: Journal of geophysical research. Space physics
ISSN: 2169-9380
URI: http://hdl.handle.net/10138/305566
Abstract: Abstract Interplanetary coronal mass ejections (ICMEs) are a significant feature of the heliospheric environment and the primary cause of adverse space weather at the Earth. ICME propagation, and the evolution of ICME magnetic field structure during propagation, are still not fully understood. We analyze the magnetic field structures of 18 ICME magnetic flux ropes observed by radially aligned spacecraft in the inner heliosphere. Similarity in the underlying flux rope structures is determined through the application of a simple technique that maps the magnetic field profile from one spacecraft to the other. In many cases, the flux ropes show very strong underlying similarities at the different spacecraft. The mapping technique reveals similarities that are not readily apparent in the unmapped data and is a useful tool when determining whether magnetic field time series observed at different spacecraft are associated with the same ICME. Lundquist fitting has been applied to the flux ropes and the rope orientations have been determined; macroscale differences in the profiles at the aligned spacecraft may be ascribed to differences in flux rope orientation. Assuming that the same region of the ICME was observed by the aligned spacecraft in each case, the fitting indicates some weak tendency for the rope axes to reduce in inclination relative to the solar equatorial plane and to align with the solar east-west direction with heliocentric distance.
Subject: CMES
CORONAL MASS EJECTIONS
EVOLUTION
FIELD
INTERPLANETARY MAGNETIC CLOUDS
MAGNETOSHEATH
MESSENGER
SOLAR-WIND
STEREO
VENUS-EXPRESS
coronal mass ejections
flux ropes
inner heliosphere
radially aligned spacecraft
115 Astronomy, Space science
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