A Survey of Coronal Mass Ejections Measured In Situ by Parker Solar Probe during 2018–2022

• DOI: 10.3847/1538-4357/ad320c
• Publication Date: 2024-04-29T09:20:28Z
• Authors: Tarik Mohammad Sa...; Teresa Nieves-Chi...; Lan K. Jian; Noé Lugaz; Fernando Carcaboso; Emma E. Davies; Yaireska M. Colla...
• Keywords: QB460-466; Heliosphere; Solar coronal mass ejections; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Solar wind; Catalogs; Interplanetary magnetic fields; Astrophysics

Abstract We present a statistical investigation of the radial evolution 28 interplanetary coronal mass ejections (ICMEs), measured in situ by Parker Solar Probe spacecraft from 2018 October to 2022 August. First, analyzing distribution ICME classification based on magnetic hodograms, we find that coherent configurations are more likely be observed close Sun. By contrast, complex farther out. also notice post-ICME field is impacted following an passage at larger heliocentric distances. Second, with multilinear robust regression, derive slower ejecta (ME) expansion rate within 1 au compared previous estimates. Then, investigating fluctuations sheaths, see these strongly coupled relative strength gradient upstream solar wind ME. Third, identify ME as important factor formation sheaths. Finally, determine distortion parameter (DiP), which measure asymmetry discover lower overall asymmetries MEs. reveal even for expanding MEs, time duration over sampled does not correlate DiP values, indicating aging effect sole contributor asymmetries.