PSP Bibliography


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Solar wind energy flux observations in the inner heliosphere: First results from Parker Solar Probe

AuthorLiu, M.; Issautier, K.; Meyer-Vernet, N.; Moncuquet, M.; Maksimovic, M.; Halekas, J.; Huang, J.; Griton, L.; Bale, S.; Bonnell, J.; Case, A.; Goetz, K.; Harvey, P.; Kasper, J.; MacDowall, R.; Malaspina, D.; Pulupa, M.; Stevens, M.;
KeywordsParker Data Used; parker solar probe; Solar Probe Plus
Abstract\ Aims: We investigate the solar wind energy flux in the inner heliosphere using 12-day observations around each perihelion of Encounter One (E01), Two (E02), Four (E04), and Five (E05) of Parker Solar Probe (PSP), respectively, with a minimum heliocentric distance of 27.8 solar radii (R$_\ensuremath\odot$). \ Methods: Energy flux was calculated based on electron parameters (density n$_e$, core electron temperature T$_c$, and suprathermal electron temperature T$_h$) obtained from the simplified analysis of the plasma quasi-thermal noise (QTN) spectrum measured by RFS/FIELDS and the bulk proton parameters (bulk speed V$_p$ and temperature T$_p$) measured by the Faraday Cup onboard PSP, SPC/SWEAP. \ Results: Combining observations from E01, E02, E04, and E05, the averaged energy flux value normalized to 1 R$_\ensuremath\odot$ plus the energy necessary to overcome the solar gravitation (W$_R\ensuremath\odot$) is about 70 \ensuremath\pm 14 W m$^\ensuremath-2$, which is similar to the average value (79 \ensuremath\pm 18 W m$^\ensuremath-2$) derived by Le Chat, G., Issautier, K., \& Meyer-Vernet, N. (2012, Sol. Phys., 279, 197) from 24-yr observations by Helios, Ulysses, and Wind at various distances and heliolatitudes. It is remarkable that the distributions of W$_R\ensuremath\odot$ are nearly symmetrical and well fitted by Gaussians, much more so than at 1 AU, which may imply that the small heliocentric distance limits the interactions with transient plasma structures.
Year of Publication2021
JournalAstronomy and Astrophysics
Number of PagesA14
Date Publishedjun