๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

The magnetic fields of active regions

โœ Scribed by Robert F. Howard

Publisher
Springer
Year
1989
Tongue
English
Weight
826 KB
Volume
123
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

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, polarity separations, total and net magnetic fluxes, magnetic complexities, and polarity orientations are defined. A relationship is found between polarity orientation and region size in the sense that regions with less magnetic flux tend to show greater deviation on average from the usual polarity orientation.

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The magnetic fields of active regions
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โœ Robert F. Howard ๐Ÿ“‚ Article ๐Ÿ“… 1991 ๐Ÿ› Springer ๐ŸŒ English โš– 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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โœ Robert F. Howard ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› Springer ๐ŸŒ English โš– 538 KB

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

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โœ Robert F. Howard ๐Ÿ“‚ Article ๐Ÿ“… 1991 ๐Ÿ› Springer ๐ŸŒ English โš– 663 KB

The Mount Wilson coarse array magnetograph data set is analyzed to determine characteristics of magnetic regions as a function of distance from the average latitude, ~o, of regions in each hemisphere, a quantity which varies during the activity cycle. Regions with normal polarity axis orientations a