On Saddle-like Structures in the Solar Corona

V. P. Filippov and N. S. Shilova

Institute of Terrestrial Magnetism, Aeronomy, and Radiowave Propagation, Russian Academy of Sciences,
Troitsk, Moscow oblast, 142092, Russia

Received February 8, 1996

Abstract—The saddle-like structures visible in some soft X-ray solar images obtained by the Yohkoh satellite
are discussed. There is a small coronal hole with contours shaped in a star or cross at the center of such struc-
tures. Coronal saddles originate in a magnetic configuration with a high degree of symmetry, namely, a quadru-
polar configuration. Comparison with models indicates that the open lines in these holes cannot be modeled
using a source surface.

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