Abstract
The ionospheric total electron content was measured continuously from Macquarie Island (54.5°S, 150.0°E geographic) by monitoring the Faraday rotation of the polarization angle of the radio beacon from the geostationary satellite INTELSAT 2F-2. The ray path from the satellite often passes through the auroral oval during nighttime, and an association has been found between total electron content increases and auroral particle precipitation as determined from all sky camera photographs. The results from 31 March 1970 are examined. Simultaneous all sky camera photographs indicate a total electron content increase caused by a multiple quiet arc structure. The average electron density was calculated from electron content data in conjunction with the auroral dimensions determined from the photographs. The average electron density over a height range up to about 170 km for a multiple quiet arc structure was 3.0 × 10 5 cm −3. The subsequent breakup and poleward expansive phase of the substorm produced a further electron content increase.
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