Peculiar behaviour of solar cycle-23 in comparison to previous solar cycles

Mishra, Bhupendra; Mishra, A. P.

doi:10.1007/s12648-012-0050-1

Cited by 2 publications

(1 citation statement)

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“…Cycle 23 showed a slow rise compared to other odd-numbered cycles and was found to be weak compared to other odd-numbered cycle Chowdhury et al 2013). Additionally, it shows an unusual second peak during the declining phase Mishra & Mishra 2012). Moreover, the temporal characteristics of cycle 23, such as sunspot number and sunspot area, are similar to the Gleissberg global minimum cycles 11, 13 and 14, which occurred between 1880 and 1930, as well as solar cycle 20 (Krainev 2012).…”

Section: Introductionmentioning

confidence: 65%

Observations and Modeling of North-South Asymmetries Using a Flux Transport Dynamo

Shetye

Tripathi

Dikpati

2015

ApJ

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The peculiar behaviour of the solar cycle 23 and its prolonged minima has been one of the most studied problems over the last few years. In the present paper, we study the asymmetries in active region magnetic flux in the northern and southern hemispheres during complete solar cycle 23 and rising phase of solar cycle 24. During the declining phase of solar cycle 23, we find that the magnetic flux in the southern hemisphere is about 10 times stronger than that in the northern hemisphere during the declining phase of the solar cycle 23 and during the rising phase of cycle 24, however, this trend reversed. The magnetic flux becomes about a factor of 4 stronger in the northern hemisphere to that of southern hemisphere. Additionally, we find that there was significant delay (about 5 months) in change of the polarity in the southern hemisphere in comparison with the northern hemisphere. These results provide us with hints of how the toroidal fluxes have contributed to the solar dynamo during the prolonged minima in the solar cycle 23 and in the rising phase of the solar cycle 24. Using a solar flux-transport dynamo model, we demonstrate that persistently stronger sunspot cycles in one hemisphere could be caused by the effect of greater inflows into active region belts in that hemisphere. Observations indicate that greater inflows are associated with stronger activity. Some other change or difference in meridional circulation between hemispheres could cause the weaker hemisphere to become the stronger one.Further, the rise and fall of solar cycle 23 has been discussed by many authors; it has

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Section: Introductionmentioning

confidence: 65%