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Title:
Large-scale patterns formed by solar active regions during the ascending phase of cycle 21
Authors:
Gaizauskas, V.; Harvey, K. L.; Harvey, J. W.; Zwaan, C.
Affiliation:
AA(National Research Council, Herzberg Institute of Astrophysics, Ottawa, Canada), AB(Solar Physics Research Corp., Tucson, AZ), AC(Kitt Peak National Observatory, Tucson, AZ), AD(Utrecht, Rijksuniversiteit, Utrecht, Netherlands)
Publication:
Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 1056-1065. (ApJ Homepage)
Publication Date:
02/1983
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
MAGNETIC FLUX, SOLAR ACTIVITY, SOLAR CYCLES, SOLAR MAGNETIC FIELD, SUNSPOTS, ASTRONOMICAL MAPS, MAGNETIC FIELD CONFIGURATIONS, MAGNETIC SIGNATURES, PHOTOSPHERE, POLARITY, SOLAR ROTATION, SYNOPTIC MEASUREMENT
DOI:
10.1086/160747
Bibliographic Code:
1983ApJ...265.1056G

Abstract

Synoptic maps of photospheric magnetic fields prepared at the Kitt Peak National Observatory are used in investigating large-scale patterns in the spatial and temporal distribution of solar active regions for 27 solar rotations between 1977 and 1979. The active regions are found to be distributed in 'complexes of activity' (Bumba and Howard, 1965). With the working definition of a complex of activity based on continuity and proximity of the constituent active regions, the phenomenology of complexes is explored. It is found that complexes of activity form within one month and that they are typically maintained for 3 to 6 solar rotations by fresh injections of magnetic flux. During the active lifetime of a complex of activity, the total magnetic flux in the complex remains steady to within a factor of 2. The magnetic polarities are closely balanced, and each complex rotates about the sun at its own special, constant rate. In certain cases, the complexes form two diverging branches.

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