关于SOLIS-VSM观测的极区磁通量的纬度分布
On the Latitude Distribution of the Polar Magnetic Flux as Observed by SOLIS-VSM
摘要：
利用太阳天气光学长期研究项目的矢量分光磁力仪（VSM）的磁图来研究极地太阳帽中作为纬度函数的磁通量元素的纬度分布。我们发现，磁通量的密度分布归一化的极冠表面和平均几个月的太阳两极附近减少。当仅考虑具有相对大尺寸的通量元件时，这种趋势更加明显。后者的通量密度从极冠边缘到70 $^\circ$ -75 $^\circ$纬度相对平坦，到太阳极显著降低。较小通量特征的密度更均匀地分布，尽管减小仍然存在但不太明显。这一结果对于研究将磁通量从太阳低纬带到高纬导致太阳活动周期逆转的纬向流具有重要意义。这些结果对研究快速太阳风的极地结构，如极地羽流也很重要。
英文摘要：
Magnetograms from the Vector SpectroMagnetograph (VSM) of the Synoptic Optical Long-term Investigations of the Sun (SOLIS) project are utilized to study the latitude distribution of magnetic flux elements as a function of latitude in the polar solar caps. We find that the density distribution of the magnetic flux normalized by the surface of the polar cap and averaged over months decreases close to the solar poles. This trend is more pronounced when considering only flux elements with relatively large size. The flux density of the latter is relatively flat from the edge of the polar cap up to latitudes of 70$^\circ$--75$^\circ$ and decreases significantly to the solar pole. The density of smaller flux features is more uniformly distributed although the decrease is still present but less pronounced. This result is important in studying meridional flows that bring the magnetic flux from lower to higher solar latitudes resulting in the solar cycle reversal. The results are also of importance in studying polar structures contributing to the fast solar wind, such as polar plumes.
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