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The angular-momentu...
The angular-momentum flux in the solar wind observed during Solar Orbiter's first orbit
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- Verscharen, Daniel (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.;Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
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- Stansby, David (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- Finley, Adam J. (författare)
- Univ Paris Saclay, Dept Astrophys AIM, F-91191 Gif Sur Yvette, France.;Univ Paris, CNRS, CEA, F-91191 Gif Sur Yvette, France.
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- Owen, Christopher J. (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- Horbury, Timothy (författare)
- Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
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- Maksimovic, Milan (författare)
- Univ Paris, Sorbonne Univ, CNRS, Univ PSL,Observ Paris,LESIA, 5 Pl Jules Janssen, F-92195 Meudon, France.
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- Velli, Marco (författare)
- Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA.
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- Bale, Stuart D. (författare)
- Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.;Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.;Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.;Queen Mary Univ London, Sch Phys & Astron, London E1 4NS, England.
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- Louarn, Philippe (författare)
- Inst Rech Astrophys & Planetol, F-31028 Toulouse 4, France.
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- Fedorov, Andrei (författare)
- Inst Rech Astrophys & Planetol, F-31028 Toulouse 4, France.
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- Bruno, Roberto (författare)
- INAF Ist Astrofis & Planetol Spaziali, I-00133 Rome, Italy.
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- Livi, Stefano (författare)
- Southwest Res Inst, San Antonio, TX 78238 USA.
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- Khotyaintsev, Yuri V. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Vecchio, Antonio (författare)
- Univ Paris, Sorbonne Univ, CNRS, Univ PSL,Observ Paris,LESIA, 5 Pl Jules Janssen, F-92195 Meudon, France.;Radboud Univ Nijmegen, Radboud Radio Lab, Dept Astrophys IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands.
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- Lewis, Gethyn R. (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- Anekallu, Chandrasekhar (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- Kelly, Christopher W. (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- Watson, Gillian (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- Kataria, Dhiren O. (författare)
- Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
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- O'Brien, Helen (författare)
- Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
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- Evans, Vincent (författare)
- Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
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- Angelini, Virginia (författare)
- Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
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Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England;Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA. Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England. (creator_code:org_t)
- 2021-12-14
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Aims. We present the first measurements of the angular-momentum flux in the solar wind recorded by the Solar Orbiter spacecraft. Our aim is to validate these measurements to support future studies of the Sun's angular-momentum loss. Methods. We combined 60-min averages of the proton bulk moments and the magnetic field measured by the Solar Wind Analyser and the magnetometer onboard Solar Orbiter. We calculated the angular-momentum flux per solid-angle element using data from the first orbit of the mission's cruise phase in 2020. We separated the contributions from protons and from magnetic stresses to the total angular-momentum flux.Results. The angular-momentum flux varies significantly over time. The particle contribution typically dominates over the magnetic-field contribution during our measurement interval. The total angular-momentum flux shows the largest variation and is typically anti-correlated with the radial solar-wind speed. We identify a compression region, potentially associated with a co-rotating interaction region or a coronal mass ejection, which leads to a significant localised increase in the angular-momentum flux, albeit without a significant increase in the angular momentum per unit mass. We repeated our analysis using the density estimate from the Radio and Plasma Waves instrument. Using this independent method, we find a decrease in the peaks of positive angular-momentum flux, but otherwise, our results remain consistent.Conclusions. Our results largely agree with previous measurements of the solar wind's angular-momentum flux in terms of amplitude, variability, and dependence on radial solar-wind bulk speed. Our analysis highlights the potential for more detailed future studies of the solar wind's angular momentum and its other large-scale properties with data from Solar Orbiter. We emphasise the need for studying the radial evolution and latitudinal dependence of the angular-momentum flux in combination with data from Parker Solar Probe and other assets at heliocentric distances of 1 au and beyond.
Ämnesord
- 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)
Nyckelord
- magnetohydrodynamics (MHD)
- plasmas
- Sun
- magnetic fields
- solar wind
- stars
- rotation
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Verscharen, Dani ...
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Stansby, David
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Finley, Adam J.
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Owen, Christophe ...
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Horbury, Timothy
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Maksimovic, Mila ...
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visa fler...
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Velli, Marco
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Bale, Stuart D.
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Louarn, Philippe
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Fedorov, Andrei
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Bruno, Roberto
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Livi, Stefano
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Khotyaintsev, Yu ...
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Vecchio, Antonio
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Lewis, Gethyn R.
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Anekallu, Chandr ...
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Kelly, Christoph ...
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Watson, Gillian
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Kataria, Dhiren ...
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O'Brien, Helen
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Evans, Vincent
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Angelini, Virgin ...
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NATURVETENSKAP
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Uppsala universitet