Average properties of bipolar magnetic regions during sunspot cycle 21

Details Average properties of bipolar magnetic regions during sunspot cycle 21 Average properties of bipolar magnetic regions during sunspot cycle 21

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124...81w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 124, no. 1, 1989, p. 81-100. Research supported by the U.S. Navy.

Physics

92

Magnetic Field Configurations, Magnetic Flux, Solar Magnetic Field, Sunspot Cycle, Dynamo Theory, Magnetic Field Inversions, Solar Activity, Solar Cycles

Scientific paper

The statistical properties of some 2700 bipolar magnetic regions (BMRs) with magnetic fluxes equal to or greater than 3 x 10 to the 20th Mx, which erupted during 1976-1986, are examined. The analysis shows the following: (1) the average flux per BMR declined between 1977 and 1985; (2) the average tilts of BMRs relative to the east-west line increase toward higher latitudes; (3) weaker BMRs had larger root-mean-square tilt angles than stronger BMRs at all latitudes; and (4) over the interval 1976-1986, BMRs with their leading poles equatorward of their trailing poles contributed a total of 4 times as much flux as BMRs with inverted tilts, but the relative amount of flux contributed by BMRs with inverted or zero tilts increased as the sunspot cycle progressed.

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