EGU21-14779, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-14779
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Source-dependent properties of the background slow solar wind encountered by Parker Solar Probe

Léa Griton1, Sarah Watson1, Nicolas Poirier1, Alexis Rouillard1, Karine Issautier2, Michel Moncuquet2, Rui Pinto1, Stuart Bale3, and Justin Kasper4
Léa Griton et al.
  • 1CNRS - IRAP, Toulouse Cedex 4, France (lgriton@irap.omp.eu)
  • 2LESIA - Observatoire de Paris - Université PSL - Meudon, France
  • 3Space Sciences Laboratory and Physics Department, University of California, Berkeley, CA, USA -- The Blackett Laboratory, Imperial College London, London, UK -- School of Physics and Astronomy, Queen Mary University of London, London, UK
  • 4Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA -- Smithsonian Astrophysical Observatory, Cambridge, MA, USA

Different states of the slow solar wind are identified from in-situ measurements by Parker Solar Probe (PSP) inside 50 solar radii from the Sun (Encounters 1, 2, 4, 5 and 6). At such distances the wind measured at PSP has not yet undergone significant transformation related to the expansion and propagation of the wind. We focus in this study on the properties of the quiet solar wind with no magnetic switchbacks. The Slow Solar Wind (SSW) states differ by their density, flux, plasma beta and magnetic pressure. PSP's magnetic connectivity established with Potential Field Source Surface (PFSS) reconstructions, tested against extreme ultraviolet (EUV) and white-light imaging, reveals the different states under study generally correspond to transitions from streamers to equatorial coronal holes. Solar wind simulations run along these differing flux tubes reproduce the slower and denser wind measured in the streamer and the more tenuous wind measured in the coronal hole. Plasma heating is more intense at the base of the streamer field lines rooted near the boundary of the equatorial hole than those rooted closer to the center of the hole. This results in a higher wind flux driven inside the streamer than deeper inside the equatorial hole. 

How to cite: Griton, L., Watson, S., Poirier, N., Rouillard, A., Issautier, K., Moncuquet, M., Pinto, R., Bale, S., and Kasper, J.: Source-dependent properties of the background slow solar wind encountered by Parker Solar Probe, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14779, https://doi.org/10.5194/egusphere-egu21-14779, 2021.

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