Hiraiso Solar-Terrestrial Research Center, Communications Research Laboratory/National Institute of Polar Research
抄録(英)
The scanning beam riometer at Syowa Station, Antarctica (66.1°inv. lat.) detected drift of auroral absorptions during a severe geomagnetic storm in February 1986. Eastward drifts predominated in the morning sector (0600-0930 MLT) on February 8,1986,with speeds ranging from 1.0 to 3.8km/s. These drift velocities are considerably greater than those (60-700m/s) obtained under a moderately disturbed condition reported by T. KIKUCHI et al. (Ann. Geophys., 8,431,1990) while the drift direction was the same for both cases. The eastward drift takes place with a decrease in the geomagnetic H-component, with its speed being proportional to the H-component deflection from the quiettime level. It is suggested that both the absorption drift and ionospheric currents are subjected to a common earthward electric field in the magnetosphere. Therefore, the high drift velocity may indicate an intensification of the electric field in the magnetosphere.
雑誌書誌ID
AA10756224
雑誌名
Proceedings of the NIPR Symposium on Upper Atmosphere Physics
Drift of auroral absorption observed in February 1986 with the scanning beam riometer at Syowa Station
.png)
KJ00000036012
(2.18MB)
概要
