Differential Rotation of Strong Magnetic Flux During Solar Cycles 21?–?23 |
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| Authors: | W B Song X S Feng F Shen J P Guo |
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| Institution: | (1) Indian Institute of Astrophysics, Bangalore, 560 034, India |
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| Abstract: | In the present investigation we measure the differential rotation of strong magnetic flux during solar cycles 21 – 23 with
the method of wavelet transforms. We find that the cycle-averaged synodic rotation rate of strong magnetic flux can be written
as ω=13.47−2.58sin 2
θ or ω=13.45−2.06sin 2
θ−1.37sin 4
θ, where θ is the latitude. They agree well with the results derived from sunspots. A north–south asymmetry of the rotation rate is
found at high latitudes (28°<θ<40°). The strong flux in the southern hemisphere rotates faster than that in the northern hemisphere by 0.2 deg day−1. The asymmetry continued for cycles 21 – 23 and may be a secular property. |
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