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Evidence for a fundamental period of the sun and its relation to the 154 day complex of periodicities
Bai, T.; Sturrock, P. A.
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 476-486. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Solar Flares, Solar Interior, Stellar Envelopes, Data Processing, Periodic Variations, Power Spectra, Sunspots
Bibliographic Code:


We have analyzed the longitude distributions of major flares observed in the 1955-1991 interval, referring them to coordinate systems rotating about axes tilted with respect to the rotation axis of the solar envelope. We find that the longitude distribution exhibits the largest modulation in the coordinate system with the following parameters: rotation period, 25.50 days; tilt angle of the rotation axis, 40 deg; tilt direction, toward the position of the earth on December 4 in its orbit around the sun. We interpret this as being due to an obliquely rotating structure (or a wave pattern rotating about an oblique axis) which has two exciters. We identify the period of 25.50 days as the fundamental period of the hypothetical 'clock' proposed by Bai and Sturrock (1991). The periods of the subharmonics are 51.0, 76.5, 102.0, 127.5, and 153.0 days, in agreement with periodicities found from analysis of flare occurrence times.

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