Neutral winds and electric fields in the dusk auroral oval. I - Measurements

Mathematics – Logic

Scientific paper

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Atmospheric Electricity, Auroral Zones, Magnetic Storms, Wind Measurement, Wind Profiles, Aluminum, Artificial Clouds, Barium, E Region, Magnetic Signatures, Neutral Sheets, Vertical Distribution

Scientific paper

Two rockets carrying an upleg and downleg trimethyl aluminum chemical trail release and three barium cannisters were launched from Poker Flat, Alaska on Feb. 28, 1978 and Mar. 2, 1978 in order to study neutral winds and electric fields in the dusk auroral oval. Electric field measurements were also made with a radar system to supplement the barium cloud data. The barium cloud drifts on both days showed intense poleward electric fields in the subauroral region. The drifts were nearly latitude-independent and were equivalent to electric fields of 60 mV/m of February 2 and 40 mV/m on March 2. The data indicate that the Lorentz force and Joule heating had a strong influence on the observed neutral winds.

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