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Crescent-Shaped Ele...
Crescent-Shaped Electron Distributions at the Nonreconnecting Magnetopause : Magnetospheric Multiscale Observations
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- Tang, B. -B (author)
- Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China
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- Li, Wenya (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China.;Swedish Inst Space Phys, Uppsala, Sweden.
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- Graham, Daniel B. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Uppsala, Sweden.
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- Rager, A. C. (author)
- Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Wang, C. (author)
- Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China.;Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China.
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- Khotyaintsev, Yu. V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Uppsala, Sweden.
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- Lavraud, B. (author)
- Univ Toulouse, Inst Rech Astrophys & Planetol, Toulouse, France.,NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.,Southwest Res Inst, San Antonio, TX USA.
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- Hasegawa, H. (author)
- Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan.
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- Zhang, Y. -C (author)
- Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China
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- Dai, L. (author)
- Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China.
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- Giles, B. L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD, USA
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- Dorelli, J. C. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD, USA
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- Russell, C. T. (author)
- Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA.
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- Lindqvist, Per-Arne (author)
- KTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Stockholm, Sweden
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- Ergun, R. E. (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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- Burch, J. L. (author)
- Southwest Res Inst, San Antonio, TX, USA
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(creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2019
- 2019
- English.
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In: Geophysical Research Letters. - : AMER GEOPHYSICAL UNION. - 0094-8276 .- 1944-8007. ; 46:6, s. 3024-3032
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Crescent‐shaped electron distributions perpendicular to the magnetic field are an important indicator of the electron diffusion region in magnetic reconnection. They can be formed by the electron finite gyroradius effect at plasma boundaries or by demagnetized electron motion. In this study, we present Magnetospheric Multiscale mission observations of electron crescents at the flank magnetopause on 20 September 2017, where reconnection signatures are not observed. These agyrotropic electron distributions are generated by electron gyromotion at the thin electron‐scale magnetic boundaries of a magnetic minimum after magnetic curvature scattering. The variation of their angular range in the perpendicular plane is in good agreement with predictions. Upper hybrid waves are observed to accompany the electron crescents at all four Magnetospheric Multiscale spacecraft as a result of the beam‐plasma instability associated with these agyrotropic electron distributions. This study suggests electron crescents can be more frequently formed at the magnetopause.
- Plain Language SummaryIn this study, we present Magnetospheric Multiscale mission observations of electron crescents at the flank magnetopause and these agyrotropic electron distributions are formed at thin electron‐scale magnetic boundaries after electron pitch angle scattering by the curved magnetic field. These results suggest that agyrotropic electron distributions can be more frequently formed at the magnetopause: (1) magnetic reconnection is not necessary, although electron crescents are taken as one of the observational signatures of the electron diffusion region, and (2) agyrotropic electron distributions can cover a large local time range to the flank magnetopause. In addition, upper hybrid waves accompanied with the electron crescents are observed as a result of the beam‐plasma interaction associated with these agyrotropic electron distributions. This suggests that high‐frequency waves play a role in electron dynamics through wave‐particle interactions.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- agyrotropic electron distributions
- electron finite gyroradius effect
- upper hybrid waves
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Tang, B. -B
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Li, Wenya
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Graham, Daniel B ...
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Rager, A. C.
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Wang, C.
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Khotyaintsev, Yu ...
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show more...
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Lavraud, B.
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Hasegawa, H.
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Zhang, Y. -C
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Dai, L.
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Giles, B. L.
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Dorelli, J. C.
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Russell, C. T.
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Lindqvist, Per-A ...
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Ergun, R. E.
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Burch, J. L.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
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Geophysical Rese ...
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Uppsala University
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Royal Institute of Technology