Using Optical and Riometer Observations to Study the Relationship Between the Spatio-temporal Evolution of Magnetic Field Topology and Dispersionless Electron Injection

Details Using Optical and Riometer Observations to Study the Relationship Between the Spatio-temporal Evolution of Magnetic Field Topology and Dispersionless Electron Injection Using Optical and Riometer Observations to Study the Relationship Between the Spatio-temporal Evolution of Magnetic Field Topology and Dispersionless Electron Injection

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1680d&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1680

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2764] Magnetospheric Physics / Plasma Sheet, [2790] Magnetospheric Physics / Substorms

Scientific paper

In an electron injection, inner central plasma sheet fluxes of energetic electrons increase dramatically around the time of a substorm expansion phase onset. If the injection is dispersionless, then the increase is simultaneous across a broad range of energies. It is widely accepted that the Dispersionless Injection (DI) is observed in the region of space and at the time of the dipolarization. Recent observational studies of various signatures of DI and other onset related phenomena have led to a number of conclusions about the spatio-temporal evolution of DI. These include the fact that DI begins on field lines threading the transition region between dipolar and stretched magnetic field topologies and subsequently expands both tailward and earthward, and that DI begins in a radially narrow and azimuthally extended region. In this paper, we present observations of proton and electron aurora, riometer absorption, and in situ high-energy electron fluxes, all from the minutes around substorm expansion phase onset. We describe how these observations corroborate the idea that DI begins in the region of transition between dipolar and tail-like topologies, and further how they support the hypothesis that in the last few minutes of the growth phase the transition region is radially narrow, that after onset the narrow transition retreats tailward, and that this retreat is the tailward expansion of the DI. We assert that these results set the quantitative stage for numerical simulations that can be used to explore the physical mechanism responsible for DI.

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