Coronal holes and their relation to the background and local magnetic fields.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Sun: Corona, Sun: Magnetic Field

Scientific paper

We correlate the evolution of coronal holes with the development of the large-scale distribution of solar magnetic fields during the years 1991 and 1992. We see strong ties between the formation of coronal holes and the latest stages of evolution of complexes of activity, closely related to the regularities in the longitudinal distribution of solar magnetic fields. We also deduce that the evolution of a coronal hole is a global process, depending on the contemporary general stage of solar activity, in which the equatorial and polar holes are strongly bound together. We estimate the interrelations of coronal holes and their magnetic fields with magnetic fields of associated active regions, and also measure the values of the longitudinal magnetic flux. We have found a close relation of coronal holes to older active regions which results in the influence of the intensity and topology of the active region's magnetic field on the resulting configuration of the lines of force of the coronal hole's magnetic field, extending into interplanetary space.

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