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| Titel |
A novel code for numerical 3-D MHD studies of CME expansion |
| VerfasserIn |
J. Kleimann, A. Kopp, H. Fichtner, R. Grauer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 3 ; Nr. 27, no. 3 (2009-03-02), S.989-1004 |
| Datensatznummer |
250016433
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| Publikation (Nr.) |
 copernicus.org/angeo-27-989-2009.pdf |
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| Zusammenfassung |
A recent third-order, essentially non-oscillatory central scheme to
advance the equations of single-fluid magnetohydrodynamics (MHD) in
time has been implemented into a new numerical code. This code
operates on a 3-D Cartesian, non-staggered grid, and is able to
handle shock-like gradients without producing spurious
oscillations.
To demonstrate the suitability of our code for the simulation of
coronal mass ejections (CMEs) and similar heliospheric transients,
we present selected results from test cases and perform studies of
the solar wind expansion during phases of minimum solar activity. We
can demonstrate convergence of the system into a stable Parker-like
steady state for both hydrodynamic and MHD winds. The model is
subsequently applied to expansion studies of CME-like plasma
bubbles, and their evolution is monitored until a stationary state
similar to the initial one is achieved.
In spite of the model's (current) simplicity, we can confirm the
CME's nearly self-similar evolution close to the Sun, thus
highlighting the importance of detailed modelling especially at
small heliospheric radii.
Additionally, alternative methods to implement boundary
conditions at the coronal base, as well as strategies to ensure a
solenoidal magnetic field, are discussed and evaluated. |
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