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Open magnetic fields in active regions

✍ Scribed by Zdeněk Švestka; Craig V. Solodyna; Robert Howard; Randolph H. Levine

Publisher
Springer
Year
1977
Tongue
English
Weight
852 KB
Volume
55
Category
Article
ISSN
0038-0938

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✦ Synopsis

Soft X-ray observations confirm that some of the dark gaps seen between interconnecting loops and inner cores of active regions may be loci of open fields, as it has been predicted by global potential extrapolation of photospheric magnetic fields. It seems that the field lines may open only in a later state of the active region development.

📜 SIMILAR VOLUMES

The magnetic fields of active regions
The magnetic fields of active regions
✍ Robert F. Howard 📂 Article 📅 1991 🏛 Springer 🌐 English ⚖ 720 KB

Magnetogram data are analyzed to study daily variations of tilt angles of the magnetic axes of active regions defined by magnetic fields measured with the Mount Wilson magnetograph. The period covered by this daily data set is 1967 through April 9, 1990. It is found that on average regions with posi

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✍ Robert F. Howard 📂 Article 📅 1989 🏛 Springer 🌐 English ⚖ 826 KB

The Mount Wilson daily magnetogram data set is used in its coarse format to determine various statistical properties of magnetic regions. The method of defining magnetic regions is described, and also the criteria for a 'return' of a magnetic region from one day to the next are given. Region sizes,

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The Mount Wilson coarse array data set is used to define active regions in the interval 1967 to August, 1988. From the positions of these active regions on consecutive days, rotation rates are derived. The differential rotation of the active regions is calculated and compared with previous magnetic