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Parker Solar Probe Encounters the Leg of a Coronal Mass Ejection at 14 Solar Radii
We use Parker Solar Probe (PSP) observations to report the first direct measurements of the particle and field environments while crossing the leg of a coronal mass ejection (CME) very close to the Sun (\raisebox-0.5ex\textasciitilde14 Rs). An analysis that combines imaging from 1 au and PSP with a CME model, predicts an encounter time and duration that correspond to an unusual, complete dropout in low-energy solar energetic ions from H-Fe, observed by the Integrated Science Investigation of the Sun (IS\ensuremath\odotIS). T ...
McComas, D.~J.; Sharma, T.; Christian, E.~R.; Cohen, C.~M.~S.; Desai, M.~I.; Hill, M.~E.; Khoo, L.~Y.; Matthaeus, W.~H.; Mitchell, D.~G.; Pecora, F.; Rankin, J.~S.; Schwadron, N.~A.; Szalay, J.~R.; Shen, M.~M.; Braga, C.~R.; Mostafavi, P.~S.; Bale, S.~D.;
Published by: \apj Published on: feb
YEAR: 2023   DOI: 10.3847/1538-4357/acab5e
Parker Data Used; Solar coronal mass ejections; interplanetary magnetic fields; Interplanetary medium; Interplanetary particle acceleration; Solar energetic particles; Solar wind; Solar coronal heating; Solar magnetic flux emergence; 310; 824; 825; 826; 1491; 1534; 1989; 2000
Alpha-Proton Differential Flow of the Young Solar Wind: Parker Solar Probe Observations
The velocity of alpha particles relative to protons can vary depending on the solar wind type and distance from the Sun. Measurements from the previous spacecraft provided the alpha-proton differential velocities down to 0.3 au. The Parker Solar Probe (PSP) now enables insights into differential flows of the newly accelerated solar wind closer to the Sun for the first time. Here we study the difference between proton and alpha bulk velocities near PSP perihelia of encounters 3-7 when the core solar wind is in the field of vi ...
Mostafavi, P.; Allen, R.~C.; McManus, M.~D.; Ho, G.~C.; Raouafi, N.~E.; Larson, D.~E.; Kasper, J.~C.; Bale, S.~D.;
Published by: \apjl Published on: feb
YEAR: 2022   DOI: 10.3847/2041-8213/ac51e1
Parker Data Used; 1534; 1544; 1492; 1476; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics