The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4
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...
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Copernicus Publications
2017-08-01
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Series: | Annales Geophysicae |
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doaj-206f74e1d6b845098e0e3c34d9e6988c2020-11-24T23:19:33ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762017-08-013590792210.5194/angeo-35-907-2017The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4A. Lakka0T. I. Pulkkinen1A. P. Dimmock2A. Osmane3I. Honkonen4M. Palmroth5P. Janhunen6Department of Electronics and Nanoengineering, Aalto University, Espoo, FinlandDepartment of Electronics and Nanoengineering, Aalto University, Espoo, FinlandDepartment of Electronics and Nanoengineering, Aalto University, Espoo, FinlandDepartment of Electronics and Nanoengineering, Aalto University, Espoo, FinlandFinnish Meteorological Institute, Helsinki, FinlandDepartment of Physics, University of Helsinki, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandWe 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.https://www.ann-geophys.net/35/907/2017/angeo-35-907-2017.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. Lakka T. I. Pulkkinen A. P. Dimmock A. Osmane I. Honkonen M. Palmroth P. Janhunen |
spellingShingle |
A. Lakka T. I. Pulkkinen A. P. Dimmock A. Osmane I. Honkonen M. Palmroth P. Janhunen The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4 Annales Geophysicae |
author_facet |
A. Lakka T. I. Pulkkinen A. P. Dimmock A. Osmane I. Honkonen M. Palmroth P. Janhunen |
author_sort |
A. Lakka |
title |
The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4 |
title_short |
The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4 |
title_full |
The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4 |
title_fullStr |
The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4 |
title_full_unstemmed |
The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4 |
title_sort |
impact on global magnetohydrodynamic simulations from varying initialisation methods: results from gumics-4 |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2017-08-01 |
description |
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. |
url |
https://www.ann-geophys.net/35/907/2017/angeo-35-907-2017.pdf |
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