Tail reconnection in the global magnetospheric context: Vlasiator first results

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

  • Minna Palmroth
  • Sanni Hoilijoki
  • Liisa Juusola
  • Tuija Pulkkinen

  • Heli Hietala
  • Yann Pfau-Kempf
  • Urs Ganse
  • Sebastian Von Alfthan
  • Rami Vainio
  • Michael Hesse

Organisaatiot

  • University of Helsinki
  • Finnish Meteorological Institute
  • University of California at Los Angeles
  • CSC - IT Center for Science Ltd.
  • University of Turku
  • University of Bergen

Kuvaus

The key dynamics of the magnetotail have been researched for decades and have been associated with either three-dimensional (3-D) plasma instabilities and/or magnetic reconnection. We apply a global hybrid-Vlasov code, Vlasiator, to simulate reconnection self-consistently in the ion kinetic scales in the noon-midnight meridional plane, including both dayside and nightside reconnection regions within the same simulation box. Our simulation represents a numerical experiment, which turns off the 3-D instabilities but models ion-scale reconnection physically accurately in 2-D. We demonstrate that many known tail dynamics are present in the simulation without a full description of 3-D instabilities or without the detailed description of the electrons. While multiple reconnection sites can coexist in the plasma sheet, one reconnection point can start a global reconfiguration process, in which magnetic field lines become detached and a plasmoid is released. As the simulation run features temporally steady solar wind input, this global reconfiguration is not associated with sudden changes in the solar wind. Further, we show that lobe density variations originating from dayside reconnection may play an important role in stabilising tail reconnection.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut1269-1274
Sivumäärä6
JulkaisuAnnales Geophysicae
Vuosikerta35
Numero6
TilaJulkaistu - 28 marraskuuta 2017
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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