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  • Tang, B. -BChinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China (författare)

Crescent-Shaped Electron Distributions at the Nonreconnecting Magnetopause : Magnetospheric Multiscale Observations

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • AMER GEOPHYSICAL UNION,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-382993
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-382993URI
  • https://doi.org/10.1029/2019GL082231DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251342URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska &engelska

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Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20190521
  • 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.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Li, WenyaUppsala 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.(Swepub:uu)wenli806 (författare)
  • Graham, Daniel B.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Uppsala, Sweden.(Swepub:uu)dangr618 (författare)
  • Rager, A. C.Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA. (författare)
  • Wang, C.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. (författare)
  • Khotyaintsev, Yu. V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Uppsala, Sweden.(Swepub:uu)ykh28990 (författare)
  • Lavraud, B.Univ Toulouse, Inst Rech Astrophys & Planetol, Toulouse, France.,NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.,Southwest Res Inst, San Antonio, TX USA. (författare)
  • Hasegawa, H.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan. (författare)
  • Zhang, Y. -CChinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China (författare)
  • Dai, L.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China. (författare)
  • Giles, B. L.NASA, Goddard Space Flight Ctr, Greenbelt, MD, USA (författare)
  • Dorelli, J. C.NASA, Goddard Space Flight Ctr, Greenbelt, MD, USA (författare)
  • Russell, C. T.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA. (författare)
  • Lindqvist, Per-ArneKTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Stockholm, Sweden(Swepub:kth)u1yukyk9 (författare)
  • Ergun, R. E.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA. (författare)
  • Burch, J. L.Southwest Res Inst, San Antonio, TX, USA (författare)
  • Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R ChinaInstitutet för rymdfysik, Uppsalaavdelningen (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Geophysical Research Letters: AMER GEOPHYSICAL UNION46:6, s. 3024-30320094-82761944-8007

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