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  • Louarn, P.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)

Multiscale views of an Alfvenic slow solar wind : 3D velocity distribution functions observed by the Proton-Alpha Sensor of Solar Orbiter

  • Artikel/kapitelEngelska2021

Förlag, utgivningsår, omfång ...

  • 2021-12-14
  • EDP Sciences,2021
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-464260
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-464260URI
  • https://doi.org/10.1051/0004-6361/202141095DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

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Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Context. The Alfvenic slow solar wind is of particular interest, as it is often characterized by intense magnetic turbulence, complex proton 3D velocity distribution functions (VDF), and an ensuing richness of kinetic and dynamic processes.Aims. We take advantage of the fast time cadence of measurements taken by the Proton-Alpha Sensor (PAS) on board Solar Orbiter to analyze the kinetic properties of the proton population, the variability of their VDFs, and the possible link with propagating magnetic structures. We also study the magnetic (B) and velocity (V) correlation that characterizes this type of wind down to the ion gyroperiod.Methods. We analyzed the VDFs measured by PAS, a novelty that take advantages of the capability of 3D measurements at a 4 Hz cadence. In addition, we considered MAG observations.Results. We first show that there is a remarkable correlation between the B and V components observed down to timescales approaching the ion gyrofrequency. This concerns a wide variety of fluctuations, such as waves, isolated peaks, and discontinuities. The great variability of the proton VDFs is also documented. The juxtaposition of a core and a field-aligned beam is the norm but the relative density of the beam, drift speed, and temperatures can considerably change on scales as short as as a few seconds. The characteristics of the core are comparatively more stable. These variations in the beam characteristics mostly explain the variations in the total parallel temperature and, therefore, in the total anisotropy of the proton VDFs. Two magnetic structures that are associated with significant changes in the shape of VDFs, one corresponding to relaxation of total anisotropy and the other to its strong increase, are analyzed here. Our statistical analysis shows a clear link between total anisotropy (and, thus, beam characteristics) and the direction of B with respect to the Parker spiral. In the present case, flux tubes aligned with Parker spiral contain an average proton VDF with a much more developed beam (thus, with larger total anisotropy) than those that are inclined, perpendicular, or even reverse with regard to the outward direction.Conclusions. These observations document the variability of the proton VDF shape in relation to the propagation of magnetic structures. This is a key area of interest for understanding of the effect of turbulence on solar wind dynamics.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Fedorov, A.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Prech, L.Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, Prague 18000 8, Czech Republic. (författare)
  • Owen, C. J.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England. (författare)
  • Bruno, R.INAF Ist Astrofis & Planetol Spaziali, Via Fosso Cavaliere 100, I-00133 Rome, Italy. (författare)
  • Livi, S.Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA. (författare)
  • Lavraud, B.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France.;Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, Pessac, France. (författare)
  • Rouillard, A. P.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Genot, VUniv Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Andre, N.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Fruit, G.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Reville, VUniv Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Kieokaew, R.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Plotnikov, IUniv Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Penou, E.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France. (författare)
  • Barthe, A.AKA, Toulouse, France. (författare)
  • Khataria, D.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England. (författare)
  • Berthomier, M.Ecole Polytech, Lab Phys Plasmas, Palaiseau, France. (författare)
  • D'Amicis, R.INAF Ist Astrofis & Planetol Spaziali, Via Fosso Cavaliere 100, I-00133 Rome, Italy. (författare)
  • Sorriso-Valvo, LucaUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Inst Sci & Technol Plasmas, Natl Res Council, Via Amendola 122-D, I-70126 Bari, Italy(Swepub:uu)lucso160 (författare)
  • Allegrini, F.Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA. (författare)
  • Raines, J.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Harbour, MI USA. (författare)
  • Verscharen, D.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.;Univ New Hampshire, Space Sci Ctr, 8 Coll Rd, Durham, NH 03824 USA. (författare)
  • Fortunato, VPlanetek Italia Srl, Via Massaua 12, I-70132 Bari, BA, Italy. (författare)
  • Mele, G.Leonardo, Viale Lavoro 101, I-74123 Taranto, Italy. (författare)
  • Horbury, T. S.Imperial Coll London, Blackett Lab, Space & Atmospher Phys, London SW7 2AZ, England. (författare)
  • O'brien, H.Imperial Coll London, Blackett Lab, Space & Atmospher Phys, London SW7 2AZ, England. (författare)
  • Evans, VImperial Coll London, Blackett Lab, Space & Atmospher Phys, London SW7 2AZ, England. (författare)
  • Angelini, VImperial Coll London, Blackett Lab, Space & Atmospher Phys, London SW7 2AZ, England. (författare)
  • Maksimovic, M.Univ PSL, Sorbonne Univ, Univ Paris, Observ Paris,LESIA,CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France. (författare)
  • Kasper, J. C.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Harbour, MI USA. (författare)
  • Bale, S. D.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. (författare)
  • Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France.Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, Prague 18000 8, Czech Republic. (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP Sciences6560004-63611432-0746

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