During Parker Solar Probe’s first close encounter with the Sun in early 2018 November, a large number of impulsive rotations in the magnetic field were detected within 50 R s ; these also occurred in association with short-lived impulsive solar wind bursts in speed. These impulsive features are now called “switchback” events. We examined a set of these switchbacks where the boundary transition into and out of the switchback was abrupt, with fast B rotations and simultaneous solar wind speed changes occurring on timescales of less than ∼10 s; these thus appear as step function-like changes in the radial component of B and V . Our objective was to search for any diamagnetic effects that might occur especially if the boundaries are associated with quick changes in density (i.e., a steep spatial density gradient at the switchback boundary). We identified 25 switchback entries where the radial component of B , B r , quickly ...

中文翻译：

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近太阳折返边界处的磁场损失：叠加的历元分析

在派克太阳探测器于2018年11月初与太阳首次近距离接触期间，在50 R s内检测到磁场中有大量脉冲旋转; 这些也与短暂的脉冲太阳风的速度爆发有关。这些脉冲特征现在称为“回切”事件。我们检查了一组这样的折返，其中边界的突然过渡和折返突然过渡，B旋转很快，同时太阳风速变化发生在小于约10 s的时间尺度上。因此，它们在B和V的径向分量中表现为阶梯函数状变化。我们的目标是寻找可能发生的任何反磁效应，尤其是当边界与密度的快速变化（即，折返边界处的空间密度梯度陡峭）相关时。