The impact on global magnetohydrodynamic simulations from varying initialisation methods : results from GUMICS-4

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Lakka , A , Pulkkinen , T I , Dimmock , A P , Osmane , A , Honkonen , I , Palmroth , M & Janhunen , P 2017 , ' The impact on global magnetohydrodynamic simulations from varying initialisation methods : results from GUMICS-4 ' , Annales Geophysicae , vol. 35 , no. 4 , pp. 907-922 . https://doi.org/10.5194/angeo-35-907-2017

Title: The impact on global magnetohydrodynamic simulations from varying initialisation methods : results from GUMICS-4
Author: Lakka, Antti; Pulkkinen, Tuija I.; Dimmock, Andrew P.; Osmane, Adnane; Honkonen, Ilja; Palmroth, Minna; Janhunen, Pekka
Contributor: University of Helsinki, Department of Physics
Date: 2017-08-01
Language: eng
Number of pages: 16
Belongs to series: Annales Geophysicae
ISSN: 0992-7689
URI: http://hdl.handle.net/10138/215224
Abstract: We investigate the effects of different initialisation methods of the GUMICS-4 global magnetohydrodynamic (MHD) simulation to the dynamics in different parts of the Earth's magnetosphere and hence compare five 12 h simulation runs that were initiated by 3 h of synthetic data and followed by 9 h of solar wind measurements using the OMNI data as input. As a reference, we use a simulation run that includes nearly 60 h of OMNI data as input prior to the 9 h interval examined with different initialisations. The selected interval is a high-speed stream event during a 10-day interval (12-22 June 2007). The synthetic initialisations include stepwise, linear and sinusoidal functions of the interplanetary magnetic field with constant density and velocity values. The results show that the solutions converge within 1 h to give a good agreement in both the bow shock and the magnetopause position. However, the different initialisation methods lead to local differences which should be taken into consideration when comparing model results to satellite measurements.
Subject: Magnetospheric physics
magnetosphere-ionosphere interactions
magnetospheric configuration and dynamics
space plasma physics
numerical simulation studies
INTERPLANETARY MAGNETIC-FIELD
MHD SIMULATION
PLASMA TRANSPORT
MAGNETOSPHERE
MAGNETOPAUSE
WIND
RECONNECTION
MODELS
IMF
FLUCTUATIONS
115 Astronomy, Space science
114 Physical sciences
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