Abstract
In this study we use a numerical simulation of an artificial coronal mass ejection (CME) to validate a method for calculating propagation directions and kinematical profiles of interplanetary CMEs (ICMEs). In this method observations from heliospheric images are constrained with in-situ plasma and field data at 1 AU. These data are used to convert measured ICME elongations into distance by applying the harmonic mean approach, which assumes a spherical shape of the ICME front. We used synthetic white-light images, similar to those observed by STEREO-A/HI, for three different separation angles between remote and in-situ spacecraft of 30∘, 60∘, and 90∘. To validate the results of the method, the images were compared to the apex speed profile of the modeled ICME, as obtained from a top view. This profile reflects the “true” apex kinematics because it is not affected by scattering or projection effects. In this way it is possible to determine the accuracy of the method for revealing ICME propagation directions and kinematics. We found that the direction obtained by the constrained harmonic mean method is not very sensitive to the separation angle (30∘ sep: ϕ=W7; 60∘ sep: ϕ=W12; 90∘ sep: ϕ=W15; true dir.: E0/W0). For all three cases the derived kinematics agree relatively well with the real kinematics. The best consistency is obtained for the 30∘ case, while with growing separation angle the ICME speed at 1 AU is increasingly overestimated (30∘ sep: ΔV arr≈− 50 km s−1, 60∘ sep: ΔV arr≈+ 75 km s−1, 90∘ sep: ΔV arr≈+ 125 km s−1). Especially for future L4/L5 missions, the 60∘ separation case is highly interesting in order to improve space-weather forecasts.
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Acknowledgements
This work has received funding from the European Commission FP7 Project n∘ 263252 [COMESEP]. MT acknowledges the Austrian Science Fund (FWF): V195-N16. This research was supported by a Marie Curie International Outgoing Fellowship within the 7th European Community Framework Programme. NL was supported by NSF AGS1239704 and NASA NNX12AB28G. Simulation results were obtained using the Space Weather Modeling Framework, developed by the Center for Space Environment Modeling, at the University of Michigan with funding support from NASA ESS, NASA ESTO-CT, NSF KDI, and DoD MURI. We thank the STEREO SECCHI/IMPACT/PLASTIC teams for their open data policy.
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Rollett, T., Temmer, M., Möstl, C. et al. Assessing the Constrained Harmonic Mean Method for Deriving the Kinematics of ICMEs with a Numerical Simulation. Sol Phys 283, 541–556 (2013). https://doi.org/10.1007/s11207-013-0246-3
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DOI: https://doi.org/10.1007/s11207-013-0246-3