... B. von Rekowski[*]
Now at: Department of Astronomy & Space Physics, Uppsala University, Box 515, 751 20 Uppsala, Sweden. 
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... A. Brandenburg[*]
NORDITA, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark. 
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... W. Dobler[*]
Kiepenheuer-Institute für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany. 
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... time[*]
See movie at http://www.nordita.dk/~brandenb/movies/outflow 
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... ideal[*]
If we restrict ourselves to $0.2\le z\la 8$, about $90\%$ of the points for $\widetilde\Omega(a)$ are within $\pm 10\%$ of the line representing z=4; for the other three invariants, this percentage is at least $97\%$. In a larger domain, $0.2\le z\la 30$, these percentages drop to about $80\%$ for k(a) and $60\%$ for $\widetilde\Omega(a)$; for $\ell (a)$ and e(a), however, they remain greater than $90\%$. 
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Copyright ESO 2003