Physics – Plasma Physics
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11603215s&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A3, CiteID A03215
Physics
Plasma Physics
Space Plasma Physics: Discontinuities (2109), Space Plasma Physics: Mhd Waves And Instabilities (2149, 2752, 6050)
Scientific paper
We present an original study of the dynamical changes measured in the far tail at XGSM ≈ -255 RE, onboard STEREO-B, related to very weak substorm activity (AE < 100 nT). Three weak auroral electrojet perturbations are well correlated with motions of the far tail in which the spacecraft passes from the lobe to the boundary layer or to the magnetosheath. These boundary motions can hardly be related to a plasmoid as a widening of the tail is expected from such a high-pressure structure. Furthermore, for one of the AE enhancements, ground measurement of auroral luminosity and ground magnetic field provided a precise timing of the substorm onset, thus allowing estimation of the propagation speed of the tail disturbance, supposing it is initiated at ˜20 RE in the midtail. The computed velocity, 1800 km/s, much greater than the typical plasmoid propagation speed, implies that the tail disturbance is due to a large-scale wave propagating inside the lobe, initiated inside the inner plasma sheet at substorm onset and linked to current disruption and/or magnetic reconnection.
Frey Harald U.
Jacquey Christian
Kistler Lynn
Larson David
Lavraud Benoit
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