Physics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11604201k&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A4, CiteID A04201
Physics
Magnetospheric Physics: Substorms, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Magnetospheric Configuration And Dynamics
Scientific paper
Significant populations of electrons with energies of tens of keV appear in the Earth's inner central plasma sheet during the substorm expansion phase. Increasing observational evidence indicates that these injections begin at a radially narrow but azimuthally extended transition between very stretched and less stretched field lines around 8 RE. In this work we suggest that the tailward retreat of this transition region can be responsible for adiabatic acceleration of electrons which is sufficient to cause ionospheric signatures of the dispersionless injections observed by riometers. To support this mechanism we develop a novel conceptual magnetotail magnetic field model with a few adjustable parameters which can be easily constrained by observations. Our calculations show that a tailward motion of the transition region at the speed of 0.8 RE/min is required to achieve good agreement with riometer observations.
Donovan Eric
Kabin Konstantin
Rankin Robert
Samson John C.
Spanswick Emma
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