On the initial orientation of emerging active regions

The initial orientation of 74 active regions is measured in high-resolution pictures. Because previous works by the author (Garcia de la Rosa, 1984) suggest a different behavior between large and small active regions, the sample has been divided into those two classes whose dividing line is set at s...

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Bibliographic Details
Published in:Solar physics 1986-02, Vol.103 (2), p.249-257
Main Author: GARCIA DE LA ROSA, J. I
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Other topics on the solar system
Solar system
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Summary:The initial orientation of 74 active regions is measured in high-resolution pictures. Because previous works by the author (Garcia de la Rosa, 1984) suggest a different behavior between large and small active regions, the sample has been divided into those two classes whose dividing line is set at similar to 5 x 10 super(2) super(1) Mx in the magnetic flux. It is observed that only the large regions tend to display the correct inclination (p-part at lower latitude). Their evolution toward a more parallel inclination to the Equator is also observed. The first finding is interpreted in terms of the primary nature of the large ARs that are supposed to be directly linked to the basic mechanism of solar activity. The evolution is interpreted as a reaction of the lower layers of the tube to the tilt introduced by the Coriolis effect.
ISSN:0038-0938
1573-093X
DOI:10.1007/BF00147828