Early results from the Proton Alfa Sensor (PAS/SWA) onboard Solar Orbiter: the Solar Wind at different scales. - INSU - Institut national des sciences de l'Univers Access content directly
Conference Papers Year : 2020

Early results from the Proton Alfa Sensor (PAS/SWA) onboard Solar Orbiter: the Solar Wind at different scales.

L. Prech
  • Function : Author
E. Penou
  • Function : Author
C. J. Owen
  • Function : Author
D. O. Kataria
  • Function : Author
R. Bruno
  • Function : Author
S. A. Livi
  • Function : Author
V. Evans
J. M. Raines
  • Function : Author
T. S. Horbury
  • Function : Author
H. O'Brien
  • Function : Author
V. Angelini
  • Function : Author
S. D. Bale
  • Function : Author
T. Chust
Y. Khotyaintsev
D. Plettemeier
J. Soucek
M. Steller
S. Stverak
  • Function : Author
P. Travnicek
  • Function : Author
A. Vaivads
A. Vecchio

Abstract

Solar Orbiter is designed to discover the fundamental connections between the rapidly varying solar atmosphere and the solar wind. In operations since mid-2020, the Solar Wind Analyzer (SWA) plasma package is now providing comprehensive in-situ measurements of the solar wind. In particular, the Proton-Alpha Sensor (PAS) is determining the properties of the dominant solar wind ion populations through the measurements of the 3D distribution functions, density, bulk velocities, temperatures, and heat fluxes, at temporal cadences ranging from 4 s to ~0.1 s. This offers the possibility of analyzing the solar wind dynamics at vastly different scales, from days to fractions of seconds. Specifically, kinetic structures can thus be described at unprecedented resolution, both in time or spatial scales and phase space organization of the associated ion populations. We will report on observations of various structures that propagate in the solar wind (large amplitude waves, solitary structures, discontinuities between different types of solar winds...) with a focus on the formation of non-thermal distribution functions, the associated wave activity and magnetic perturbations.
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Dates and versions

insu-03560372 , version 1 (07-02-2022)

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P. Louarn, A. Fedorov, L. Prech, B. Lavraud, A. P. Rouillard, et al.. Early results from the Proton Alfa Sensor (PAS/SWA) onboard Solar Orbiter: the Solar Wind at different scales.. American Geophysical Union, 2020, online, France. ⟨insu-03560372⟩
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