Electric field oscillations measured near an auroral arc

Computer Science – Sound

Scientific paper

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Auroral Arcs, Electric Fields, Ionospheric Sounding, Rocket Sounding, Electron Flux Density, F Region, Field Aligned Currents, Magnetohydrodynamic Waves

Scientific paper

A sounding rocket, launched into the expansive phase of an auroral substorm, measured bursts of electric field oscillations with a typical period of one second and a magnitude exceeding 20 mV/m. The oscillation appear to be due to an MHD wave propagating along the magnetic field. The bursts were observed as the sounding rocket passed over the southern border of an auroral arc. The southern border coincided with an increase in 1-5 keV electron flux and an increase in field-aligned current.

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