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Whistler instabilit...
Whistler instability driven by the sunward electron deficit in the solar wind High-cadence Solar Orbiter observations
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- Bercic, L. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Verscharen, D. (author)
- 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.
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- Owen, C. J. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Colomban, L. (author)
- LPC2E CNRS, 3 Ave Rech Sci, F-45071 Orleans 2, France.
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- Kretzschmar, M. (author)
- LPC2E CNRS, 3 Ave Rech Sci, F-45071 Orleans 2, France.
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- Chust, T. (author)
- Univ Paris Saclay, Observ Paris, Sorbonne Univ, Ecole Polytech, Paris, France.
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- Maksimovic, M. (author)
- Univ Paris Diderot, Sorbonne Univ, Sorbonne Paris Cite, Univ PSL,CNRS,LESIA,Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France.
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- Kataria, D. O. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Anekallu, C. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Behar, E. (author)
- Swedish Inst Space Phys IRF, Kiruna, Sweden.;UCA, CNRS, Lab Lagrange, OCA, Nice, France.
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- Berthomier, M. (author)
- Univ Paris Saclay, Observ Paris, Sorbonne Univ, Ecole Polytech, Paris, France.
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- Bruno, R. (author)
- INAF IAPS, Via Fosso Cavaliere 100, I-00133 Rome, Italy.
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- Fortunato, V (author)
- Planetek Italia, Bari, Italy.
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- Kelly, C. W. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Khotyaintsev, Yuri V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Lewis, G. R. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Livi, S. (author)
- Southwest Res Inst, San Antonio, TX USA.
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- Louarn, P. (author)
- Univ Toulouse, Trap, CNRS, CNES,UPS, Toulouse, France.
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- Mele, G. (author)
- Leonardo, Taranto, Italy.
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- Nicolaou, G. (author)
- Southwest Res Inst, San Antonio, TX USA.
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- Watson, G. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Wicks, R. T. (author)
- Northumbria Univ, Dept Math Phys & Elect Engn, Newcastle Upon Tyne, Tyne & Wear, England.
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Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England 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. (creator_code:org_t)
- 2021-12-14
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
- Related links:
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http://nrl.northumbr...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Context. Solar wind electrons play an important role in the energy balance of the solar wind acceleration by carrying energy into interplanetary space in the form of electron heat flux. The heat flux is stored in the complex electron velocity distribution functions (VDFs) shaped by expansion, Coulomb collisions, and field-particle interactions. Aims. We investigate how the suprathermal electron deficit in the anti-strahl direction, which was recently discovered in the near-Sun solar wind, drives a kinetic instability and creates whistler waves with wave vectors that are quasi-parallel to the direction of the background magnetic field.Methods. We combined high-cadence measurements of electron pitch-angle distribution functions and electromagnetic waves provided by Solar Orbiter during its first orbit. Our case study is based on a burst-mode data interval from the Electrostatic Analyser System (SWA-EAS) at a distance of 112 R-S (0.52 au) from the Sun, during which several whistler wave packets were detected by Solar Orbiter's Radio and Plasma Waves (RPW) instrument.Results. The sunward deficit creates kinetic conditions under which the quasi-parallel whistler wave becomes unstable. We directly test our predictions for the existence of these waves through solar wind observations. We find whistler waves that are quasi-parallel and almost circularly polarised, propagating away from the Sun, coinciding with a pronounced sunward deficit in the electron VDF. The cyclotron-resonance condition is fulfilled for electrons moving in the direction opposite to the direction of wave propagation, with energies corresponding to those associated with the sunward deficit.Conclusions. We conclude that the sunward deficit acts as a source of quasi-parallel whistler waves in the solar wind. The quasilinear diffusion of the resonant electrons tends to fill the deficit, leading to a reduction in the total electron heat flux.
Subject headings
- 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)
Keyword
- solar wind
- instabilities
- waves
- plasmas
- methods
- observational
- space vehicles
- instruments
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Bercic, L.
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Verscharen, D.
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Owen, C. J.
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Colomban, L.
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Kretzschmar, M.
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Chust, T.
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show more...
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Maksimovic, M.
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Kataria, D. O.
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Anekallu, C.
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Behar, E.
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Berthomier, M.
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Bruno, R.
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Fortunato, V
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Kelly, C. W.
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Khotyaintsev, Yu ...
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Lewis, G. R.
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Livi, S.
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Louarn, P.
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Mele, G.
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Nicolaou, G.
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Watson, G.
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Wicks, R. T.
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Uppsala University