The {\it Wide-field Imager for Solar Probe} (WISPR) on {\it Parker Solar Probe} (PSP), observing in white light, has a fixed angular field of view, extending from 13.5$^{\circ}$ to 108$^{\circ}$ from the Sun and approximately 50$^{\circ}$ in the transverse directions. Because of the highly elliptical orbit of PSP, the physical extent of the imaged coronal region varies directly as the distance from the Sun, requiring new techniques for analysis of the motions of observed density features. Here, we present a technique for determining the 3D trajectory of CMEs and other coronal ejecta moving radially at a constant velocity by first tracking the motion in a sequence of images and then applying a curve-fitting procedure to determine the trajectory parameters (distance vs. time, velocity, longitude and latitude). To validate the technique, we have determined the trajectory of two CMEs observed by WISPR that were also observed by another white-light imager, either LASCO/C3 or STEREO-A/HI1. The second viewpoint was used to verify the trajectory results from this new technique and help determine its uncertainty.

中文翻译：

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WIPR/Parker太阳探测器观测到的日冕喷射物轨迹确定

{\it Parker Solar Probe} (PSP) 上的 {\it Wide-field Imager for Solar Probe} (WISPR) 在白光下观察，具有固定的角度视野，从 13.5$^{\circ}$ 延伸到 108$^{\circ}$ 从太阳和大约 50$^{\circ}$ 在横向方向。由于 PSP 的高度椭圆轨道，成像日冕区域的物理范围直接随着距太阳的距离而变化，需要新的技术来分析观察到的密度特征的运动。在这里，我们提出了一种确定 CME 和其他以恒定速度径向移动的日冕喷射物的 3D 轨迹的技术，方法是首先跟踪图像序列中的运动，然后应用曲线拟合程序来确定轨迹参数（距离 vs. 距离）。时间、速度、经度和纬度）。为了验证技术，我们已经确定了 WISPR 观测到的两个 CME 的轨迹，它们也被另一个白光成像仪 LASCO/C3 或 STEREO-A/HI1 观测到。第二个观点用于验证这种新技术的轨迹结果并帮助确定其不确定性。