Rocket-borne measurements of particles and ion convection in dayside aurora

Computer Science – Sound

Scientific paper

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Auroral Arcs, Convective Flow, Daytime, Electron Precipitation, Ion Motion, Rocket Sounding, Auroral Ionization, Auroras, Diurnal Variations, Electronic Spectra, Particle Energy, Rocket-Borne Instruments

Scientific paper

Simultaneous measurement of ion convection, electron spectra and energetic particles were conducted from sounding rockets launched into regions of precipitating particles at invariant latitude 76 deg N and 1300 hours local time. One flight did not cross any well-defined auroral arcs and detected only soft electron spectra and energetic particles that were well above the cosmic ray background. The second flight crossed two auroral arcs, within which intense 1-keV precipitation was recorded. The high-latitude boundary, as determined by energetic particle measurements, was well poleward of the arcs, indicating that the region was on closed magnetic field lines. The similarity of dayside and nightside auroral arcs is also discussed.

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