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Helios 2 observations of solar wind turbulence decay in the inner heliosphere

Sorriso-Valvo, Luca (author)
Uppsala universitet,KTH,Rymd- och plasmafysik,Swedish Institute of Space Physics (IRF), Angström Laboratory, Lägerhyddsvägen 1, 75121 Uppsala, Sweden, Lägerhyddsvägen 1; CNR, Istituto per la Scienza e la Tecnologia dei Plasmi, Via Amendola 122/D, 70126 Bari, Italy, Via Amendola 122/D,Institutet för rymdfysik, Uppsalaavdelningen,CNR, Ist Sci & Tecnol Plasmi, Via Amendola 122-D, I-70126 Bari, Italy.;KTH Royal Inst Technol, Sch Elect Engn & Comp Sci, Space & Plasma Phys, Teknikringen 31, S-11428 Stockholm, Sweden.
Marino, R. (author)
Université de Lyon, CNRS, Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon 1, Laboratoire de Mécanique des Fluides et d' Acoustique, UMR5509, 69134 Ecully, France,Univ Claude Bernard Lyon 1, Univ Lyon, Ecole Cent Lyon, CNRS,INSA Lyon,Lab Mecan Fluides & Acoust,UMR5509, F-69134 Ecully, France.
Foldes, R. (author)
Université de Lyon, CNRS, Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon 1, Laboratoire de Mécanique des Fluides et d' Acoustique, UMR5509, 69134 Ecully, France; Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell' Aquila, Via Vetoio 42, 67100 Coppito, AQ, Italy, Via Vetoio 42, AQ,Univ Claude Bernard Lyon 1, Univ Lyon, Ecole Cent Lyon, CNRS,INSA Lyon,Lab Mecan Fluides & Acoust,UMR5509, F-69134 Ecully, France.;Univ Aquila, Dipartimento Sci Fis & Chim, Via Vetoio 42, I-67100 Coppito, AQ, Italy.
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Lévêque, E. (author)
Université de Lyon, CNRS, Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon 1, Laboratoire de Mécanique des Fluides et d' Acoustique, UMR5509, 69134 Ecully, France,Univ Claude Bernard Lyon 1, Univ Lyon, Ecole Cent Lyon, CNRS,INSA Lyon,Lab Mecan Fluides & Acoust,UMR5509, F-69134 Ecully, France.
D,Aamicis, R. (author)
National Institute for Astrophysics (INAF) - Institute for Space Astrophysics and Planetology (IAPS), Via Fosso del Cavaliere, 100, 00133 Rome, Italy, Via Fosso del Cavaliere, 100,Natl Inst Astrophys INAF, Inst Space Astrophys & Planetol IAPS, Via Fosso Cavaliere 100, I-00133 Rome, Italy.
Bruno, R. (author)
National Institute for Astrophysics (INAF) - Institute for Space Astrophysics and Planetology (IAPS), Via Fosso del Cavaliere, 100, 00133 Rome, Italy, Via Fosso del Cavaliere, 100,Natl Inst Astrophys INAF, Inst Space Astrophys & Planetol IAPS, Via Fosso Cavaliere 100, I-00133 Rome, Italy.
Telloni, D. (author)
National Institute for Astrophysics (INAF) - Astrophysical Observatory of Torino, Via Osservatorio 20, 10025 Pino Torinese, Italy, Via Osservatorio 20,Natl Inst Astrophys INAF, Astrophys Observ Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
Yordanova, Emiliya (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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 (creator_code:org_t)
2023-03-23
2023
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 672
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Aims. A linear scaling of the mixed third-order moment of the magnetohydrodynamic (MHD) fluctuations is used to estimate the energy transfer rate of the turbulent cascade in the expanding solar wind. Methods. In 1976, the Helios 2 spacecraft measured three samples of fast solar wind originating from the same coronal hole, at different distances from the Sun. Along with the adjacent slow solar wind streams, these intervals represent a unique database for studying the radial evolution of turbulence in samples of undisturbed solar wind. A set of direct numerical simulations of the MHD equations performed with the Lattice-Boltzmann code FLAME was also used for interpretation. Results. We show that the turbulence energy transfer rate decays approximately as a power law of the distance and that both the amplitude and decay law correspond to the observed radial temperature profile in the fast wind case. Results from MHD numerical simulations of decaying MHD turbulence show a similar trend for the total dissipation, suggesting an interpretation of the observed dynamics in terms of decaying turbulence and that multi-spacecraft studies of the solar wind radial evolution may help clarify the nature of the evolution of the turbulent fluctuations in the ecliptic solar wind.

Subject headings

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

Magnetohydrodynamics (MHD)
Solar wind
Turbulence

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