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The angular-momentu...
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Verscharen, DanielUniv Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.;Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
(författare)
The angular-momentum flux in the solar wind observed during Solar Orbiter's first orbit
- Artikel/kapitelEngelska2021
Förlag, utgivningsår, omfång ...
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2021-12-14
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EDP Sciences,2021
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:uu-464275
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-464275URI
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https://doi.org/10.1051/0004-6361/202140956DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Stansby, DavidUniv Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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Finley, Adam J.Univ Paris Saclay, Dept Astrophys AIM, F-91191 Gif Sur Yvette, France.;Univ Paris, CNRS, CEA, F-91191 Gif Sur Yvette, France.
(författare)
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Owen, Christopher J.Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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Horbury, TimothyImperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
(författare)
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Maksimovic, MilanUniv Paris, Sorbonne Univ, CNRS, Univ PSL,Observ Paris,LESIA, 5 Pl Jules Janssen, F-92195 Meudon, France.
(författare)
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Velli, MarcoUniv Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA.
(författare)
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Bale, Stuart D.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.
(författare)
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Louarn, PhilippeInst Rech Astrophys & Planetol, F-31028 Toulouse 4, France.
(författare)
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Fedorov, AndreiInst Rech Astrophys & Planetol, F-31028 Toulouse 4, France.
(författare)
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Bruno, RobertoINAF Ist Astrofis & Planetol Spaziali, I-00133 Rome, Italy.
(författare)
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Livi, StefanoSouthwest Res Inst, San Antonio, TX 78238 USA.
(författare)
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Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990
(författare)
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Vecchio, AntonioUniv 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.
(författare)
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Lewis, Gethyn R.Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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Anekallu, ChandrasekharUniv Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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Kelly, Christopher W.Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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Watson, GillianUniv Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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Kataria, Dhiren O.Univ Coll London, Mullard Space Sci Lab, Holmbury House, Dorking RH5 6NT, Surrey, England.
(författare)
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O'Brien, HelenImperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
(författare)
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Evans, VincentImperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
(författare)
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Angelini, VirginiaImperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England.
(författare)
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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.
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Ingår i:Astronomy and Astrophysics: EDP Sciences6560004-63611432-0746
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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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