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Quantifying the dif...
Quantifying the diffusion of suprathermal electrons by whistler waves between 0.2 and 1 AU with Solar Orbiter and Parker Solar Probe
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- Colomban, L. (författare)
- Univ Orleans, CNRS, LPC2E, CNES, 3A Ave Rech Sci, F-45071 Orleans, France.
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- Kretzschmar, M. (författare)
- Univ Orleans, CNRS, LPC2E, CNES, 3A Ave Rech Sci, F-45071 Orleans, France.
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- Krasnoselkikh, V. (författare)
- Univ Orleans, CNRS, LPC2E, CNES, 3A Ave Rech Sci, F-45071 Orleans, France.;Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA.
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- Agapitov, O. V. (författare)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA.;Natl Taras Shevchenko Univ Kyiv, Astron & Space Phys Dept, Kiev, Ukraine.
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- Froment, C. (författare)
- Univ Orleans, CNRS, LPC2E, CNES, 3A Ave Rech Sci, F-45071 Orleans, France.
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- Maksimovic, M. (författare)
- Univ Paris, Sorbonne Univ, Univ PSL, CNRS,LESIA,Observ Paris, Meudon, France.
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- Berthomier, M. (författare)
- Univ Paris Saclay, Sorbonne Univ, Ecole Polytech, Observ Paris,LPP,CNRS, Paris, France.
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- Khotyaintsev, Yuri V. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Graham, Daniel B. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Bale, S. (författare)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA.;Univ Calif Berkeley, Phys Dept, Berkeley, CA USA.
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Univ Orleans, CNRS, LPC2E, CNES, 3A Ave Rech Sci, F-45071 Orleans, France Univ Orleans, CNRS, LPC2E, CNES, 3A Ave Rech Sci, F-45071 Orleans, France.;Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA. (creator_code:org_t)
- EDP Sciences, 2024
- 2024
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 684
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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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
- Context. The evolution of the solar wind electron distribution function with heliocentric distance exhibits different features that are still unexplained, in particular, the fast decrease in the electron heat flux and the increase in the Strahl pitch angle width. Wave-particle interactions between electrons and whistler waves are often proposed to explain these phenomena.Aims. We aim to quantify the effect of whistler waves on suprathermal electrons as a function of heliocentric distance.Methods. We first performed a statistical analysis of whistler waves (occurrence and properties) observed by Solar Orbiter and Parker Solar Probe between 0.2 and 1 AU. The wave characteristics were then used to compute the diffusion coefficients for solar wind suprathermal electrons in the framework of quasi-linear theory. These coefficients were integrated to deduce the overall effect of whistler waves on electrons along their propagation.Results. About 110 000 whistler wave packets were detected and characterized in the plasma frame, including their direction of propagation with respect to the background magnetic field and their radial direction of propagation. Most waves are aligned with the magnetic field and only ∼0.5% of them have a propagation angle greater than 45°. Beyond 0.3 AU, it is almost exclusively quasi-parallel waves propagating anti-sunward (some of them are found sunward but are within switchbacks with a change of sign of the radial component of the background magnetic) that are observed. Thus, these waves are found to be Strahl-aligned and not counter-streaming. At 0.2 AU, we find both Strahl-aligned and counter-streaming quasi-parallel whistler waves.Conclusions. Beyond 0.3 AU, the integrated diffusion coefficients show that the observed waves are sufficient to explain the measured Strahl pitch angle evolution and effective in isotropizing the halo. Strahl diffusion is mainly attributed to whistler waves with a propagation angle of θ ∈ [15.45]°, although their origin has not yet been fully determined. Near 0.2 AU, counter-streaming whistler waves are able to diffuse the Strahl electrons more efficiently than the Strahl-aligned waves by two orders of magnitude.
Ämnesord
- 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)
Nyckelord
- diffusion
- plasmas
- waves
- Sun: heliosphere
- solar wind
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Colomban, L.
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Kretzschmar, M.
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Krasnoselkikh, V ...
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Agapitov, O. V.
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Froment, C.
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Maksimovic, M.
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visa fler...
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Berthomier, M.
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Khotyaintsev, Yu ...
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Graham, Daniel B ...
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Bale, S.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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Astronomy and As ...
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Uppsala universitet