Large Displacements of Conjugate Auroras in the Midnight Sector.

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  • Large Displacements of Conjugate Aurora

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Abstract

Simultaneous TV camera data were obtained at three nearly geomagnetic-conjugate stations: Husafell in Iceland, and Syowa and Asuka in Antarctica, on September 9-10 in 1991. Of the two southern stations, Syowa is more nearly conjugate to Husafell. With two stations in the Antarctica, the field of view in the southern conjugate area extends longitudinally to ∼ 1600 km at auroral heights, making it possible to investigate the spatial characteristics of auroral conjugacy. When the correlation of auroral shape and intensity between conjugate areas was examined, an interesting event was discovered in the geomagnetic recovery phase in the midnight sector. During this event, good correlation was maintained between Husafell and Asuka while no correlation existed between Husafell and Syowa, suggesting a large (500-800 km) longitudinal displacement of conjugate auroras. The cause of the longitudinal displacement is discussed.

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