Solar Cycle Related Variation in Solar Differential Rotation and Meridional Flow in Cycle 24
We studied temporal variation of the differential rotation and poleward meridional circulation during solar cycle 24 using the magnetic element feature tracking technique. We used line-of-sight magnetograms obtained using the Helioseismic and Magnetic Imager aboard the Solar Dynamics Observatory from May 01, 2010 to March 26, 2020 (for almost the entire period of solar cycle 24, Carrington Rotation from 2096 to 2229) and tracked the magnetic element features every 1 hour. We also estimated the differential rotation and poleward meridional flow velocity profiles. The observed profiles are consistent with those of previous studies on different cycles. Typical properties resulting from torsional oscillations can also be observed from solar cycle 24. The amplitude of the variation was approximately $\pm$10 m s$^{-1}$. Interestingly, we found that the average meridional flow observed in solar cycle 24 is faster than that observed in solar cycle 23. In particular, during the declining phase of the cycle, the meridional flow of the middle latitude is accelerated from 10 to 17 m s$^{-1}$, which is almost half of the meridional flow itself. The faster meridional flow in solar cycle 24 might be the result of the weakest cycle during the last 100 years.
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Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the manuscript can be downloaded and accessed as a PDF.
On 26 Nov, 2020
On 01 Nov, 2020
On 28 Oct, 2020
On 28 Oct, 2020
On 28 Oct, 2020
Received 26 Oct, 2020
On 26 Oct, 2020
Invitations sent on 25 Oct, 2020
On 25 Oct, 2020
On 30 Sep, 2020
On 29 Sep, 2020
On 29 Sep, 2020
Posted 20 May, 2020
On 17 Sep, 2020
Received 17 Jul, 2020
Invitations sent on 26 Jun, 2020
On 26 Jun, 2020
On 27 May, 2020
On 26 May, 2020
On 15 May, 2020
On 12 May, 2020
Solar Cycle Related Variation in Solar Differential Rotation and Meridional Flow in Cycle 24
On 26 Nov, 2020
On 01 Nov, 2020
On 28 Oct, 2020
On 28 Oct, 2020
On 28 Oct, 2020
Received 26 Oct, 2020
On 26 Oct, 2020
Invitations sent on 25 Oct, 2020
On 25 Oct, 2020
On 30 Sep, 2020
On 29 Sep, 2020
On 29 Sep, 2020
Posted 20 May, 2020
On 17 Sep, 2020
Received 17 Jul, 2020
Invitations sent on 26 Jun, 2020
On 26 Jun, 2020
On 27 May, 2020
On 26 May, 2020
On 15 May, 2020
On 12 May, 2020
We studied temporal variation of the differential rotation and poleward meridional circulation during solar cycle 24 using the magnetic element feature tracking technique. We used line-of-sight magnetograms obtained using the Helioseismic and Magnetic Imager aboard the Solar Dynamics Observatory from May 01, 2010 to March 26, 2020 (for almost the entire period of solar cycle 24, Carrington Rotation from 2096 to 2229) and tracked the magnetic element features every 1 hour. We also estimated the differential rotation and poleward meridional flow velocity profiles. The observed profiles are consistent with those of previous studies on different cycles. Typical properties resulting from torsional oscillations can also be observed from solar cycle 24. The amplitude of the variation was approximately $\pm$10 m s$^{-1}$. Interestingly, we found that the average meridional flow observed in solar cycle 24 is faster than that observed in solar cycle 23. In particular, during the declining phase of the cycle, the meridional flow of the middle latitude is accelerated from 10 to 17 m s$^{-1}$, which is almost half of the meridional flow itself. The faster meridional flow in solar cycle 24 might be the result of the weakest cycle during the last 100 years.
Figure 1
Figure 2
Figure 3
Figure 4
Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the manuscript can be downloaded and accessed as a PDF.