活动带的次表层经圈环流
Subsurface Meridional Circulation in the Active Belts
摘要：
一些作者已经报道了次表层纬向流随太阳活动周期的时间变化。测量值通常是在计算速度的区域中存在表面磁活动的时间段内平均的。目前的工作检查可能的污染，这些测量由于额外的速度场与活动区域加上在获得的数据中的不确定性强磁场存在。我们对GONG五年多的观测资料进行了系统的分析，并比较了去除强磁场区域前后用环图分析得到的纬向流。在去除与表面活动有关的大面积区域后，朝向太阳极小期的纬向气流振幅增加的总体趋势仍然存在。我们还发现，即使在去除表面磁活动后，仍然存在对活动带的残余环流，这表明存在全球模式或位于周边的有组织的流动。
英文摘要：
Temporal variations of the subsurface meridional flow with the solar cycle have been reported by several authors. The measurements are typically averaged over periods of time during which surface magnetic activity existed in the regions were the velocities are calculated. The present work examines the possible contamination of these measurements due to the extra velocity fields associated with active regions plus the uncertainties in the data obtained where strong magnetic fields are present. We perform a systematic analysis of more than five years of GONG data and compare meridional flows obtained by ring-diagram analysis before and after removing the areas of strong magnetic field. The overall trend of increased amplitude of the meridional flow towards solar minimum remains after removal of large areas associated with surface activity. We also find residual circulation toward the active belts that persist even after the removal of the surface magnetic activity, suggesting the existence of a global pattern or longitudinally-located organized flows.
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