Structure and dynamics in the polar cleft - Coordinated satellite and ground-based observations in the prenoon sector

Details Structure and dynamics in the polar cleft - Coordinated satellite and ground-based observations in the prenoon sector Structure and dynamics in the polar cleft - Coordinated satellite and ground-based observations in the prenoon sector

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8928s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8928-8942.

Physics

15

Auroral Zones, Birkeland Currents, Field Aligned Currents, Particle Precipitation, Satellite Observation, All Sky Photography, Dmsp Satellites, Electron Precipitation, Proton Precipitation, Solar Wind

Scientific paper

Results from airborne observations of electron and proton precipitation fluxes and Birkeland currents, and simultaneous ground-based (from Svalbard) optical measurements of dayside auroras, are presented. The combined data set made it possible to coordinate the auroral emissions, which could be separated into different latitudinal zones, with corresponding structures in the particle precipitation and Birkeland current. The temporal evolution of these structures indicated the presence of both stationary cleft emissions, produced by soft electron fluxes, and transient discrete arcs and arc fragments, corresponding to the precipitation of 1-keV electrons. The latter emissions are associated with narrow sheets of upward flowing Birkeland current and reduced proton precipitation, suggesting the presence of field-aligned potential drops above the spacecraft.

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