The magnetic field in the Sun’s corona stores energy that can be released to heat plasma and drive solar eruptions. Measurements of the global coronal magnetic field have been limited to several snapshots. In this work, we present observations, using the Upgraded Coronal Multi-channel Polarimeter, that provide 114 magnetograms of the global corona above the solar limb spanning ~8 months. We determined the magnetic field distribution with altitude in the corona and monitored the evolution at different latitudes over multiple solar rotations. The field strength between 1.05 and 1.60 solar radii varies from <1 to ~20 gauss. A signature of active longitudes appears in the coronal magnetic field measurements. Coronal models are generally consistent with our observations, though they have larger discrepancies in high-latitude regions.

中文翻译：

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观察太阳全球日冕磁场在 8 个月内的演变


太阳日冕中的磁场储存能量，这些能量可以释放出来加热等离子体并驱动太阳爆发。全球日冕磁场的测量仅限于几个快照。在这项工作中，我们展示了使用升级版日冕多通道旋光仪的观测结果，该观测仪提供了太阳边缘上方全球日冕的 114 张磁图，持续时间为 ~8 个月。我们确定了日冕中随高度变化的磁场分布，并监测了多次太阳自转在不同纬度的演变。1.05 到 1.60 太阳半径之间的场强从 <1 到 ~20 高斯不等。活动经度的特征出现在日冕磁场测量中。日冕模型与我们的观测结果基本一致，尽管它们在高纬度地区存在较大的差异。