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Solar wind current sheets and deHoffmann-Teller analysis First results from Solar Orbiter's DC electric field measurements

Steinvall, Konrad (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Rymd- och plasmafysik
Khotyaintsev, Yu, V (author)
Swedish Inst Space Phys IRF, S-75121 Uppsala, Sweden.
Cozzani, Giulia (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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Vaivads, Andris (author)
KTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Sch Elect Engn & Comp Sci, Div Space & Plasma Phys, S-11428 Stockholm, Sweden.
Yordanova, Emiliya (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Eriksson, Anders I. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Edberg, Niklas J. T. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Maksimovic, M. (author)
Univ Paris Diderot, Sorbonne Univ, CNRS, Observ Paris,Univ PSL,LESIA, Sorbonne Paris Cite,5 Pl Jules Janssen, F-92195 Meudon, France.,CNRS, LPC2E, 3A Ave Rech Sci, Orleans, France.;Univ Orleans, Orleans, France.,Austrian Acad Sci, Space Res Inst, Graz, Austria.
Bale, S. D. (author)
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.;Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.,Czech Acad Sci, Astron Inst, Prague, Czech Republic.
Chust, T. (author)
Univ Paris Saclay, Sorbonne Univ, Observ Paris, Ecole Polytech,LPP,CNRS, Paris, France.
Krasnoselskikh, V (author)
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.;CNRS, LPC2E, 3A Ave Rech Sci, Orleans, France.
Kretzschmar, M. (author)
CNRS, LPC2E, 3A Ave Rech Sci, Orleans, France.;Univ Orleans, Orleans, France.
Lorfevre, E. (author)
CNES, 18 Ave Edouard Belin, F-31400 Toulouse, France.
Plettemeier, D. (author)
Tech Univ Dresden, Helmholtz Str 10, D-01187 Dresden, Germany.
Soucek, J. (author)
Czech Acad Sci, Inst Atmospher Phys, Prague, Czech Republic.
Steller, M. (author)
Austrian Acad Sci, Space Res Inst, Graz, Austria.
Stverak, S. (author)
Czech Acad Sci, Astron Inst, Prague, Czech Republic.,Imperial Coll London, South Kensington Campus, London SW7 2AZ, England.
Vecchio, A. (author)
Univ Paris Diderot, Sorbonne Univ, CNRS, Observ Paris,Univ PSL,LESIA, Sorbonne Paris Cite,5 Pl Jules Janssen, F-92195 Meudon, France.;Radboud Univ Nijmegen, Dept Astrophys, Radboud Radio Lab, Nijmegen, Netherlands.
Horbury, T. S. (author)
Imperial Coll London, South Kensington Campus, London SW7 2AZ, England.
O'Brien, H. (author)
Imperial Coll London, South Kensington Campus, London SW7 2AZ, England.
Evans, V (author)
Imperial Coll London, South Kensington Campus, London SW7 2AZ, England.
Fedorov, A. (author)
Inst Rech Astrophys & Planetol, 9 Ave Colonel Roche,BP 4346, F-31028 Toulouse 4, France.
Louarn, P. (author)
Inst Rech Astrophys & Planetol, 9 Ave Colonel Roche,BP 4346, F-31028 Toulouse 4, France.
Genot, V (author)
Inst Rech Astrophys & Planetol, 9 Ave Colonel Roche,BP 4346, F-31028 Toulouse 4, France.
Andre, N. (author)
Inst Rech Astrophys & Planetol, 9 Ave Colonel Roche,BP 4346, F-31028 Toulouse 4, France.
Lavraud, B. (author)
Inst Rech Astrophys & Planetol, 9 Ave Colonel Roche,BP 4346, F-31028 Toulouse 4, France.;Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, Pessac, France.
Rouillard, A. P. (author)
Inst Rech Astrophys & Planetol, 9 Ave Colonel Roche,BP 4346, F-31028 Toulouse 4, France.
Owen, C. J. (author)
Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
Khotyaintsev, Yuri V. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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 (creator_code:org_t)
2021-12-14
2021
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
Related links:
http://arxiv.org/pdf...
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https://urn.kb.se/re...
https://doi.org/10.1...
https://urn.kb.se/re...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Context. Solar Orbiter was launched on 10 February 2020 with the purpose of investigating solar and heliospheric physics using a payload of instruments designed for both remote and in situ studies. Similar to the recently launched Parker Solar Probe, and unlike earlier missions, Solar Orbiter carries instruments designed to measure low-frequency DC electric fields. Aims. In this paper, we assess the quality of the low-frequency DC electric field measured by the Radio and Plasma Waves instrument (RPW) on Solar Orbiter. In particular, we investigate the possibility of using Solar Orbiter's DC electric and magnetic field data to estimate the solar wind speed. Methods. We used a deHoffmann-Teller (HT) analysis, based on measurements of the electric and magnetic fields, to find the velocity of solar wind current sheets, which minimises a single component of the electric field. By comparing the HT velocity to the proton velocity measured by the Proton and Alpha particle Sensor (PAS), we have developed a simple model for the effective antenna length, L-eff of the E-field probes. We then used the HT method to estimate the speed of the solar wind. Results. Using the HT method, we find that the observed variations in E-y are often in excellent agreement with the variations in the magnetic field. The magnitude of E-y, however, is uncertain due to the fact that the L-eff depends on the plasma environment. Here, we derive an empirical model relating L-eff to the Debye length, which we can use to improve the estimate of E-y and, consequently, the estimated solar wind speed. Conclusions. The low-frequency electric field provided by RPW is of high quality. Using the deHoffmann-Teller analysis, Solar Orbiter's magnetic and electric field measurements can be used to estimate the solar wind speed when plasma data are unavailable.

Subject headings

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

Keyword

solar wind
plasmas
magnetic reconnection
methods
data analysis

Publication and Content Type

ref (subject category)
art (subject category)

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