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Träfflista för sökning "WFRF:(Pulkkinen T.) "

Sökning: WFRF:(Pulkkinen T.)

  • Resultat 31-40 av 67
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31.
  • Hietala, H., et al. (författare)
  • Supermagnetosonic Jets behind a Collisionless Quasiparallel Shock
  • 2009
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 103:24, s. 245001-
  • Tidskriftsartikel (refereegranskat)abstract
    • The downstream region of a collisionless quasiparallel shock is structured containing bulk flows with high kinetic energy density from a previously unidentified source. We present Cluster multispacecraft measurements of this type of supermagnetosonic jet as well as of a weak secondary shock front within the sheath, that allow us to propose the following generation mechanism for the jets: The local curvature variations inherent to quasiparallel shocks can create fast, deflected jets accompanied by density variations in the downstream region. If the speed of the jet is super(magneto)sonic in the reference frame of the obstacle, a second shock front forms in the sheath closer to the obstacle. Our results can be applied to collisionless quasiparallel shocks in many plasma environments.
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32.
  • Hill, S. C., et al. (författare)
  • Magnetospheric Sources of Theta Aurora: A Case Study Comparing Observations With SWMF Global Simulation
  • 2024
  • Ingår i: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 51:10
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the first high resolution global MHD with coupled inner magnetosphere simulation results of an observed theta aurora event. We use the Space Weather Modeling Framework in the Geospace configuration, which produces accurate field aligned current closure in the ionosphere that is integral to theta aurora formation. At the location of the observed theta aurora, the simulation produces a narrow channel of Joule heating along both open and closed field lines, and between a pair of oppositely directed field-aligned current sheets in the ionosphere. We demonstrate that this Joule heating pattern that we identify as theta aurora maps to a reconnection region at the magnetotail flanks as well as in the distant magnetotail. The theta aurora maps to a cross-tail current disruption and field-aligned current source region in a highly twisted magnetotail.
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36.
  • Karlsson, SBP, et al. (författare)
  • Solar wind control of magnetospheric energy content: Substorm quenching and multiple onsets
  • 2000
  • Ingår i: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. - : AMER GEOPHYSICAL UNION. - 0148-0227. ; 105:A3, s. 5335-5356
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we report coordinated multispacecraft and ground-based observations of a double substorm onset close to Scandinavia on November 17, 1996. The Wind and the Geotail spacecraft, which were located in the solar wind and the subsolar magnetosheat
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37.
  • Kaurisitie, K., Syrjsuo, M., Amm, O., Viljanen, A., Pulkkinen, T.I. and Opgenoorth, H.J. (författare)
  • A statistical study of evening sectorarcs and electrojets.
  • 2001
  • Ingår i: Advances in Space Research. ; 28, s. 16045-1610
  • Tidskriftsartikel (refereegranskat)abstract
    • We present results of a statistical study of evening sector auroral arcs associated with electrojets. The study (including similar to 1000 all-sky camera (ASC) frames) is based on data of the MIRACLE instrument network. An automatic search engine is used
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  • Resultat 31-40 av 67
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Pulkkinen, V (12)
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