umu.sePublikasjoner
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Bow shock generator current systems: MMS observations of possible current closure
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0002-2043-4442
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. Belgian Institute for Space Aeronomy, Brussels, Belgium.ORCID-id: 0000-0001-5379-1158
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0002-5765-2806
Royal Institute of Technology, Stockholm, Sweden.
Vise andre og tillknytning
2018 (engelsk)Inngår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 123, s. 242-258Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We use data from the first two dayside seasons of the Magnetospheric Multiscale (MMS) mission to study current systems associated with quasi‐perpendicular bow shocks of generator type. We have analyzed 154 MMS bow shock crossings near the equatorial plane. We compute the current density during the crossings and conclude that the component perpendicular to the shock normal (J⊥) is consistent with a pileup of the interplanetary magnetic field (IMF) inside the magnetosheath. For predominantly southward IMF, we observe a component Jn parallel (antiparallel) to the normal for GSM Y> 0 (<0), and oppositely directed for northward IMF. This indicates current closure across the equatorial magnetosheath, and it is observed for IMF clock angles near 0∘ and 180∘. To our knowledge, these are the first observational evidence for bow shock current closure across the magnetosheath. Since we observe no clear signatures of |J⊥| decreasing toward large |Y| we suggest that the main region of current closure is further tailward, outside MMS probing region. For IMF clock angles near 90∘, we find indications of the current system being tilted toward the north‐south direction, obtaining a significant Jz component, and we suggest that the current closes off the equatorial plane at higher latitudes where the spacecraft are not probing. The observations are complicated for several reasons. For example, variations in the solar wind and the magnetospheric currents and loads affect the closure, and Jn is distributed over large regions, making it difficult to resolve inside the magnetosheath proper.

sted, utgiver, år, opplag, sider
2018. Vol. 123, s. 242-258
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-143055DOI: 10.1002/2017JA024826ISI: 000425637600018OAI: oai:DiVA.org:umu-143055DiVA, id: diva2:1166265
Tilgjengelig fra: 2017-12-14 Laget: 2017-12-14 Sist oppdatert: 2018-06-09bibliografisk kontrollert

Open Access i DiVA

fulltext(1740 kB)79 nedlastinger
Filinformasjon
Fil FULLTEXT02.pdfFilstørrelse 1740 kBChecksum SHA-512
34dbaa6f5bba55c8057c60fa17c1286d1bd4d17158b598f4f2ceb39c38e4f0eb7642b865dffaf1825d2e47a2f183f4fbab1df74c396232e58e92aa46ca967535
Type fulltextMimetype application/pdf

Andre lenker

Forlagets fulltekst

Personposter BETA

Hamrin, MariaGunell, HerbertLindkvist, Jesper

Søk i DiVA

Av forfatter/redaktør
Hamrin, MariaGunell, HerbertLindkvist, Jesper
Av organisasjonen
I samme tidsskrift
Journal of Geophysical Research - Space Physics

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 79 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 211 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf