WISPR Imaging of a Pristine CME

Abstract

The Wide-field Imager for Solar Probe (WISPR) on board the Parker Solar Probe (PSP) observed a CME on 2018 November 01, the first day of the initial PSP encounter. The speed of the CME, approximately 200-300 km s${}^{-1}$ in the WISPR field of view, is typical of slow, streamer blowout CMEs. This event was also observed by the LASCO coronagraphs. WISPR and LASCO view remarkably similar structures that enable useful cross-comparison between the two data sets as well as stereoscopic imaging of the CME. Analysis is extended to lower heights by linking the white-light observations to EUV data from AIA, which reveal a structure that erupts more than a full day earlier before the CME finally gathers enough velocity to propagate outward. This EUV feature appears as a brightness enhancement in cooler temperatures such as 171 Å, but as a cavity in nominal coronal temperatures such as 193 Å. By comparing this circular, dark feature in 193 Å\ to the dark, white-light cavity at the center of the eruption in WISPR and LASCO, it can be seen that this is one coherent structure that exists prior to the eruption in the low corona before entering the heliosphere and likely corresponds to the core of the magnetic flux rope. It is also believed that the relative weakness of the event contributed to the clarity of the flux rope in WISPR, as the CME did not experience impulsive forces or strong interaction with external structures that can lead to more complex structural evolution.

12 Pages, 9 Figures

References in corpus (2)

• Thermal Diagnostics with the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory: A Validated Method for Differential Emission Measure Inversions
• A comparison of reconstruction methods for the estimation of CME kinematics based on SECCHI/HI observations

Cited by in corpus (8)

• The Solar Orbiter mission -- Science overview
• Overview of the remote sensing observations from PSP solar encounter 10 with perihelion at 13.3 Rsun
• Detailed imaging of coronal rays with the Parker Solar Probe
• Coronal mass ejection deformation at 0.1 au observed by WISPR
• Total Electron Temperature Derived from Quasi-Thermal Noise Spectroscopy In the Pristine Solar Wind: Parker Solar Probe Observations
• Continued PSP/WISPR Observations of a Phaethon-related Dust Trail
• Variability of the slow solar wind: New insights from modelling and PSP-WISPR observations
• Sequential Small Coronal Mass Ejections Observed In~situ and in White-Light Images by Parker Solar Probe