Trajectory Determination for Coronal Ejecta Observed by WISPR/Parker Solar Probe
arXiv:2009.09323 · doi:10.1007/s11207-020-01715-y
Abstract
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 to 108 from the Sun and approximately 50 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.
arXiv comment28 pages, 11 figures, accepted by Solar Physics
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- Internal magnetic field structures observed by PSP/WISPR in a filament related coronal mass ejection
- Internal Structure of the 2019 April 2 CME
- Extracting the Heliographic Coordinates of Coronal Rays using Images from WISPR/Parker Solar Probe
- Sequential Small Coronal Mass Ejections Observed In~situ and in White-Light Images by Parker Solar Probe
- A Detailed Analysis of a Magnetic Island Observed by WISPR on Parker Solar Probe
- Constraints on the variable nature of the slow solar wind with the Wide-Field Imager on board the Parker Solar Probe