Low-altitude observations of the evolution of substorm injection boundaries

Details Low-altitude observations of the evolution of substorm injection boundaries Low-altitude observations of the evolution of substorm injection boundaries

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5815s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5815-5838.

Physics

20

Dmsp Satellites, Electron Precipitation, Magnetic Storms, Plasma Layers, Polar Orbits, Field Aligned Currents, Ions, Particle Precipitation

Scientific paper

The low-altitude polar-orbiting satellites DMSP F6 and F7 are used to analyze the properties of the evolution of the ion and electron precipitation and the magnetic field perturbations in the auroral oval during substorms. Two examples are presented where the magnetosphere-ionosphere coupling, based on the character of the particle precipitation and field-aligned current regions, exhibits different substorm responses. The ion energy cutoff of the dusk detachments exhibits the dispersion in latitude characteristic of steady state earthward transport produced by an enhanced convection electric field. It is suggested that the particle transport in the magnetosphere is disrupted at onset in the inner magnetosphere where region 2 currents are generated but continues unimpeded in the earthward region.

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