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Title: | Periodicities in the North–South Asymmetry of the Solar Differential Rotation and Surface Magnetic Field |
Authors: | Javaraiah, J Gokhale, M. H |
Keywords: | Differential Rotation Parameters Sunspot Groups Sunspot Activity Relative Magnitudes Magnetic Field Inferred |
Issue Date: | Feb-1997 |
Publisher: | Springer |
Citation: | Solar Physics, Vol. 170, No. 2, pp. 389 - 410 |
Abstract: | We have studied the temporal variations in the north–south asymmetries of the differential rotation parameters A, B, and the mean rotation rate , by determining their values from Greenwich data for sunspot groups (1879–1976) in the northern and southern hemispheres, during moving time intervals of lengths 3 yr and 5 yr, successively displaced by 1 yr. The variation in the north–south asymmetry (A a) of is similar to the variation in the asymmetry (B ) of B but with opposite sign. These variations of and B may represent components of an anti-symmetric torsional oscillation which are in opposite phase with each other. The FFT and MEM analyses of the temporal variations of B , , and the north–south asymmetry (A ) of A, show existence of significant periodicities: 45.5 ± 11.5 yr,21.3 ± 4.5 yr, 13.3 ± 1.5 yr, and 10.5 ± 0.5 yr. These analyses also show a few other possible periodicities in A , B , and . All these periodicities are also seen in the north–south asymmetry of sunspot activity (with similar relative magnitudes). The 22-yr periodicity was seen in even-parity modes of magnetic field inferred from sunspot data. |
Description: | Restricted Access |
URI: | http://hdl.handle.net/2248/3314 |
ISSN: | 0038-0938 |
Appears in Collections: | IIAP Publications |
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Periodicities in the North–South Asymmetry of the Solar Differential Rotation and Surface Magnetic Field Restricted Access | Restricted Access | 256.92 kB | Adobe PDF | View/Open Request a copy |
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