科学衛星EXOS-D(あけぼの)で観測された沿磁力線電流の解析

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Field-aligned currents (FACs), which have an important role to control the magneto-sphere-ionosphere coupling, have been studied using the magnetic fleld data obtained by the EXOS-D (AKEBONO) satellite. The satellite is the fourth scientific spacecraft for terrestrial environment (exospheric) observations in Japan. It was launched on 22 February, 1989 (JST) into the semi-polar orbit with a 75° orbital inclination and the altitude of perigee and apogee were 275km and 10,500km. The FACs are examined at the altitude from 3,000km to 10,000km in the evening and morning sectors during the two months from December 1989 to January 1990. Characteristics of the FACs are as follows; (1) Magnetic signatures of FACs are observed in the geomagnetic latitude from 60° to 80°. (2) These magnetic signatures can be divided into two types with the latitudinal scale; one is a large scale larger than 1-2° in latitude and the other is small less than that. (3) Small scale FACs are embeded into large scale FACs. (4) Large scale FACs can be classified into two types; the first shows the eastward deflection of the magnetic field occurred in the evening to the midnight sector, and the second is the westward deflection of the magnetic field observed from the midnight to the morning sector. (5) Flowing direction of the large scale FACs is different between in the poleward region and in the equatorward region. In the evening sector, the FACs flow into the magnetosphere from the ionosphere in the poleward region, while in the equatorward region the FACs flow to the opposite direction. In the morning sector, the FACs flow into the ionosphere from the magnetosphere in the poleward region and they flow to the opposite direction in the equatorward region. (6) Small scale FACs are generally observed with large scale FACs and current intensity enhances at high latitude side of large scale FACs.
東海大学の論文

科学衛星EXOS-D(あけぼの)で観測された沿磁力線電流の解析

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