Abstract
McIntosh active-region classifications reported during a five-year period were examined to determine similarities among the classes. Two methods were used extensively to determine these similarities. The number of transitions among classes were used to determine the most frequent transitions out of each class, and the alternative classes reported for the same region by different sites were used to establish which classes were neighboring classes. These transition frequencies and neighboring classes were used to identify classes that could be eliminated or merged with other classes. Class similarities were used to investigate the relative importance of several pairs of decisions that occur within a single McIntosh parameter. In particular, the redundancy of parameters in some classes was examined, and the class similarities were used to identify which of these parameters could be eliminated. Infrequently reported classes were also considered, and suggestions for mergers were made when similarities between classes could be identified.
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References
Bornmann, P. L.: 1994,Solar Phys., in preparation.
Bornmann, P. L. and Prescott, K.: 1994,Solar Phys., submitted.
Bornmann, P. L. and Shaw, D.: 1992a, in Z. Švestka, B. V. Jackson, and M. E. Machado (eds.), ‘Eruptive Solar Flares’,IAU Colloq. 133,Lecture Notes in Physics 399, 337.
Bornmann, P. L. and Shaw, D.: 1992b, ‘Simplified Active-Region Classifications and Solar Flare Production’, inSolar-Terrestrial Predictions Proceedings, in press.
Bornmann, P. L. and Shaw, D.: 1994,Solar Phys. 150, 127 (this issue).
Bornmann, P. L., Kalmbach, D., Kulhanek, D., and Casale, A.: 1990, in P. A. Simonet al. (eds.),Solar-Terrestrial Predictions Proceedings, p. 301.
Bray, R. J. and Loughhead, R. E.: 1964,Sunspots, Dover, New York.
International Ursigram and World Days Service: 1969, Synoptic Codes for Solar and Geophysical Data.
Kiepenheuer, K. O.: 1953, in G. P. Kuiper (ed.),The Sun, p. 322.
Kildahl, K. J. N.: 1980, in R. F. Donnelly (ed.),Solar-Terrestrial Predictions Proceedings, Vol. 3, p. C-166.
McIntosh, P. S.: 1990,Solar Phys. 125, 251.
Solar Geophysical Data (Supplement): 1972, No. 330 (February),Descriptive Text, p. 25.
Solar Geophysical Data (Supplement): 1987, No. 515 (February),Descriptive Text, p. 23.
Taylor, P. O.: 1991,Observing the Sun, Cambridge University Press, Cambridge.
U.S. Air Force: 1981,Solar Optical Observing, AWS Pamphlet 105-60.
U.S. Air Force: 1991,Solar Optical Observing Techniques, AFSFC Pamphlet 105-2.
Waldmeier, M.: 1947,Publ. Zürich Obs. 9, 1.
Waldmeier, M.: 1955,Ergebnisse und Probleme der Sonnenforschung, Akademische Verlagsge-sellschaft Geest & Protig K.-G., Leipzig, p. 166.
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Bornmann, P.L., Kalmbach, D. & Kulhanek, D. McIntosh active-region class similarities and suggestions for mergers. Sol Phys 150, 147–164 (1994). https://doi.org/10.1007/BF00712883
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DOI: https://doi.org/10.1007/BF00712883