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Träfflista för sökning "WFRF:(Fazakerley A.) ;pers:(Stenberg G.)"

Sökning: WFRF:(Fazakerley A.) > Stenberg G.

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2.
  • André, Mats, et al. (författare)
  • Magnetic reconnection and cold plasma at the magnetopause
  • 2010
  • Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 37:22, s. L22108-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on detailed observations by the four Cluster spacecraft of magnetic reconnection and a Flux Transfer Event (FTE) at the magnetopause. We detect cold (eV) plasma at the magnetopause with two independent methods. We show that the cold ions can be essential for the electric field normal to the current sheet in the separatrix region at the edge of the FTE and for the associated acceleration of ions from the magnetosphere into the reconnection jet. The cold ions have small enough gyroradii to drift inside the limited separatrix region and the normal electric field can be balanced by this drift, E approximate to -v x B. The separatrix region also includes cold accelerated electrons, as part of the reconnection current circuit.
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3.
  • Backrud, M., et al. (författare)
  • Cluster observations and theoretical explanations of broadband waves in the auroral region
  • 2005
  • Ingår i: Annales Geophysicae. - : Copernicus Publications. - 1432-0576. ; 23, s. 3739-3752
  • Tidskriftsartikel (refereegranskat)abstract
    •  Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to the methods. We find that much of the wave emissions are consistent with linear waves in homogeneous plasma. Observed waves with a large electric field perpendicular to the geomagnetic field are more common (electrostatic ion cyclotron waves), while ion acoustic waves with a large parallel electric field appear in smaller regions without suprathermal (tens of eV) plasma. The regions void of suprathermal plasma are interpreted as parallel potential drops of a few hundred volts.
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