An Interpretation of the Differences in the Solar Differential Rotation during Even and Odd Sunspot Cycles

Details An Interpretation of the Differences in the Solar Differential Rotation during Even and Odd Sunspot Cycles An Interpretation of the Differences in the Solar Differential Rotation during Even and Odd Sunspot Cycles

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...626..579j&link_type=abstract

The Astrophysical Journal, Volume 626, Issue 1, pp. 579-584.

Astronomy and Astrophysics

Astronomy

12

Sun: Activity, Sun: Magnetic Fields, Sun: Rotation, Sun: Sunspots

Scientific paper

Using the data on sunspot groups during the period 1879-2004, we have found that the solar equatorial rotation rate during the odd-numbered sunspot cycles is well correlated with the equatorial rotation rate of the preceding even-numbered sunspot cycles, which is similar to the well-known Gnevyshev & Ohl rule (G-O rule) in sunspot activity. This indicates that a 22 yr cycle in the equatorial rotation rate begins in an even-numbered cycle and ends in the following odd-numbered cycle, the same as a solar magnetic cycle (Hale cycle), as inferred from the G-O rule. On the other hand, the latitudinal gradient of the solar rotation during the even-numbered cycles is found to be well correlated with that of the preceding odd-numbered cycles. This result indicates that a 22 yr cycle in the latitudinal gradient begins in an odd-numbered cycle and ends in the following even-numbered cycle. That is, the phase of the beginning of a 22 yr cycle in the latitudinal gradient is different by about 180° relative to the beginning of a 22 yr magnetic cycle.

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