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Comparative Study of the Kinetic Properties of Proton and Alpha Beams in the Alfvénic Wind Observed by SWA-PAS On Board Solar Orbiter

Bruno, Roberto (författare)
INAF-Istituto di Astrofisica e Planetologia Spaziali, Via Fosso del Cavaliere 100, 00133 Roma, Italy;, Via Fosso del Cavaliere 100
De Marco, Rossana (författare)
INAF-Istituto di Astrofisica e Planetologia Spaziali, Via Fosso del Cavaliere 100, 00133 Roma, Italy;, Via Fosso del Cavaliere 100
D’Amicis, Raffaella (författare)
INAF-Istituto di Astrofisica e Planetologia Spaziali, Via Fosso del Cavaliere 100, 00133 Roma, Italy;, Via Fosso del Cavaliere 100
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Perrone, Denise (författare)
ASI - Italian Space Agency Via del Politecnico, 00133, Rome, Italy, Via del Politecnico
Marcucci, Maria Federica (författare)
INAF-Istituto di Astrofisica e Planetologia Spaziali, Via Fosso del Cavaliere 100, 00133 Roma, Italy;, Via Fosso del Cavaliere 100
Telloni, Daniele (författare)
INAF - Osservatorio Astrofisico di Torino, Torino, Italy
Marino, Raffaele (författare)
Université Lyon, CNRS, École Centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon I, Laboratoire de Mécanique des Fluides et d’Acoustique, UMR5509, F-69134 Écully, France
Sorriso-Valvo, Luca (författare)
KTH,Rymd- och plasmafysik,CNR, Istituto per la Scienza e la Tecnologia dei Plasmi, Via Amendola 122/D, 70126 Bari, Italy
Fortunato, Vito (författare)
Planetek Italia S.R.L., Via Massaua, 12, 70132 Bari, BA, Italy, Via Massaua, 12, BA
Mele, Gennaro (författare)
LEONARDO spa, Grottaglie, Taranto, 74023, Italy, Grottaglie
Monti, Francesco (författare)
TSD-Space, Via San Donato 23, 80126 Napoli, Italy, Via San Donato 23
Fedorov, Andrei (författare)
Institut de Recherche en Astrophysique et Planétologie, CNRS, Université de Toulouse, CNES, Toulouse, France
Louarn, Philippe (författare)
Institut de Recherche en Astrophysique et Planétologie, CNRS, Université de Toulouse, CNES, Toulouse, France
Owen, Chris J. (författare)
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK, Holmbury St. Mary, Dorking
Livi, Stefano (författare)
Southwest Research Institut e, 6220 Culebra Road, San Antonio, TX 78238, USA, 6220 Culebra Road
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 (creator_code:org_t)
American Astronomical Society, 2024
2024
Engelska.
Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 969:2
Relaterad länk:
https://doi.org/10.3...
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https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • The problems of heating and acceleration of solar wind particles are of significant and enduring interest in astrophysics. The interactions between waves and particles are crucial in determining the distributions of proton and alpha particles, resulting in non-Maxwellian characteristics, including temperature anisotropies and particle beams. These processes can be better understood as long as the beam can be separated from the core for the two major components of the solar wind. We utilized an alternative numerical approach that leverages the clustering technique employed in machine learning to differentiate the primary populations within the velocity distribution rather than employing the conventional bi-Maxwellian fitting method. Separation of the core and beam revealed new features for protons and alphas. We estimated that the total temperature of the two beams was slightly higher than that of their respective cores, and the temperature anisotropy for the cores and beams was larger than 1. We concluded that the temperature ratio between alphas and protons largely over 4 is due to the presence of a massive alpha beam, which is approximately 50% of the alpha core. We provided evidence that the alpha core and beam populations are sensitive to Alfvénic fluctuations and the surfing effect found in the literature can be recovered only when considering the core and beam as a single population. Several similarities between proton and alpha beams would suggest a common and local generation mechanism not shared with the alpha core, which may not have necessarily been accelerated and heated locally.

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

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