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Development of a Complex of Activity in the Solar Corona by Robert Howard; Zdeněk Švestka is a Physics and Astronomy article available to read on EtoBox.

What is Development of a Complex of Activity in the Solar Corona about?

Skylab observations of the Sun in soft X-rays gave us the first possibility to study the development of a complex of activity inthe solar corona during its whole lifetime of seven solar rotations. The basic components of the activity complex were permanently interconnected (including across the equator) through sets of magnetic field lines, which suggests similar connections also below the photosphere. However, the visibility of individual loops in these connections was greatly variable and typically shorter than one day. Each brightening of a coronal loop in X-rays seems to be related to a variation in the photospheric magnetic field near its footpoint. Only loops (rarely visible) connecting active regions with remnants of old fields can be seen in about the same shape for many days. The interconnecting X-ray loops do not connect sunspots. We point out several examples of possible reconnections of magnetic field lines, giving rise to the onset of the visibility or, more likely, to sudden enhancements of the loop emission. In one case a new system of loops brightened in X-rays, while the field lines definitely could not have reconnected. Some striking brightenings show association

Who reads Development of a Complex of Activity in the Solar Corona?

Author

Robert Howard; Zdeněk Švestka

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0038-0938)

Published

1977

Language

EN

Field

Physics and Astronomy (Physical Sciences)