Solar Polar Fields During Cycles 21-23: Correlation with Meridional Flows

被引:34
|
作者
Janardhan, P. [1 ]
Bisoi, Susanta K. [1 ]
Gosain, S. [1 ,2 ]
机构
[1] Phys Res Lab, Astron & Astrophys Div, Ahmadabad 380009, Gujarat, India
[2] Udaipur Solar Observ, Dewali 313001, Udaipur, India
关键词
Polar magnetic fields; Meridional flows; Solar cycle; MDI magnetograms; FLUX-TRANSPORT DYNAMO;
D O I
10.1007/s11207-010-9653-x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have examined polar magnetic fields for the last three solar cycles, viz. Cycles 21, 22, and 23 using NSO/Kitt Peak synoptic magnetograms. In addition, we have used SOHO/MDI magnetograms to derive the polar fields during Cycle 23. Both Kitt Peak and MDI data at high latitudes (78A degrees -aEuro parts per thousand 90A degrees) in both solar hemispheres show a significant drop in the absolute value of polar fields from the late declining phase of the Solar Cycle 22 to the maximum of the Solar Cycle 23. We find that long-term changes in the absolute value of the polar field, in Cycle 23, are well correlated with changes in meridional-flow speeds that have been reported recently. We discuss the implication of this in influencing the extremely prolonged minimum experienced at the start of the current Cycle 24 and in forecasting the behavior of future solar cycles.
引用
收藏
页码:267 / 277
页数:11
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