Titlebook: Informatik — Wirtschaft — Gesellschaft; 23. GI — Jahrestagun Horst Reichel Conference proceedings 1993 Springer-Verlag Berlin Heidelberg 19

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-gradient maximum can be a reliable indicator of coronal-hole boundaries. We find that the magnetic-field configuration during CR 2066 has a tendency to become radially open at heliocentric distances greater than 2.5 R.. We also find that the potential-field model with a fixed source surface is inco