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

M. Liu; K. Issautier; N. Meyer-Vernet; M. Moncuquet; M. Maksimovic; J. Halekas; J. Huang; L. Griton; S. Bale; J. Bonnell; A. Case; K. Goetz; P. Harvey; J. Kasper; R. Macdowall; D. Malaspina; M. Pulupa; M. Stevens

doi:10.1051/0004-6361/202039615

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

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

M. Liu, K. Issautier, N. Meyer-Vernet, M. Moncuquet, M. Maksimovic, J. Halekas, J. Huang, L. Griton, S. Bale, J. Bonnell, …

Astronomy and astrophysics (Berlin), Vol.650, p.A14

06/01/2021

DOI: 10.1051/0004-6361/202039615

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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⊙).Methods. Energy flux was calculated based on electron parameters (density ne, core electron temperature Tc, and suprathermal electron temperature Th) obtained from the simplified analysis of the plasma quasi-thermal noise (QTN) spectrum measured by RFS/FIELDS and the bulk proton parameters (bulk speed Vp and temperature Tp) 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⊙ plus the energy necessary to overcome the solar gravitation (WR⊙) is about 70 ± 14 W m−2, which is similar to the average value (79 ± 18 W m−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 WR⊙ 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.

Astrophysics

Sciences of the Universe

Solar and Stellar Astrophysics

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Title: Subtitle: Solar wind energy flux observations in the inner heliosphere: first results from Parker Solar Probe
Creators: M. Liu - Université Paris Cité
K. Issautier - Laboratoire d’études spatiales et d’instrumentation en astrophysique
N. Meyer-Vernet - Laboratoire d’études spatiales et d’instrumentation en astrophysique
M. Moncuquet - Université Paris Cité
M. Maksimovic - Université Paris Cité
J. Halekas - University of Iowa
J. Huang - University of Michigan
L. Griton - Université Toulouse III - Paul Sabatier
S. Bale - University of California, Berkeley
J. Bonnell - University of California, Berkeley
A. Case - Smithsonian Astrophysical Observatory
K. Goetz - University of Minnesota
P. Harvey - University of California, Berkeley
J. Kasper - University of Michigan
R. Macdowall - Goddard Space Flight Center
D. Malaspina - University of Colorado Boulder
M. Pulupa - University of California, Berkeley
M. Stevens - Smithsonian Astrophysical Observatory
Resource Type: Journal article
Publication Details: Astronomy and astrophysics (Berlin), Vol.650, p.A14
DOI: 10.1051/0004-6361/202039615
ISSN: 0004-6361
eISSN: 1432-0746
Publisher: EDP Sciences
Grant note: DOI: 10.13039/501100002830, name: CNES; name: DIM ACAV+
Language: English
Date published: 06/01/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984428773502771

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