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...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/35/907/2017/angeo-35-907-2017.pdf |
| Summary: | 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. |
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| ISSN: | 0992-7689 1432-0576 |