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Internal Structure of the 2019 April 2 CME


AuthorWood, Brian; Braga, Carlos; Vourlidas, Angelos;
KeywordsParker Data Used; 1534; 310; 825; Astrophysics - Solar and Stellar Astrophysics
AbstractWe present the first analysis of internal coronal mass ejection (CME) structure observed very close to the Sun by the Wide-field Imager for Solar PRobe (WISPR) instrument on board the Parker Solar Probe (PSP). The transient studied here is a CME observed during PSP s second perihelion passage on 2019 April 2, when PSP was only 40 R $_\ensuremath\odot$ from the Sun. The CME was also well observed from 1 au by the STEREO-A spacecraft, which tracks the event all the way from the Sun to 1 au. However, PSP/WISPR observes internal structure not apparent in the images from 1 au. In particular, two linear features are observed, one bright and one dark. We model these features as two loops within the CME flux rope (FR) channel. The loops can be interpreted as bundles of field lines, with the brightness of the bright loop indicative of lots of mass being loaded into those field lines, and with the dark loop being devoid of such mass loading. It is possible that these loops are actually representative of two independent FR structures within the overall CME outline.
Year of Publication2021
Journal\apj
Volume922
Number of Pages234
Section
Date Publisheddec
ISBN
URL
DOI10.3847/1538-4357/ac2aab