Flux transfer events at the magnetopause and in the ionosphere
Flux transfer events at the magnetopause and in the ionosphere
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DOI：
10.1029/gl017i012p02241
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发表时间：
1990-11
期刊：
影响因子：
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通讯作者：
R. Elphic;M. Lockwood;S. Cowley;P. Sandholt
中科院分区：
文献类型：
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作者：
R. Elphic;M. Lockwood;S. Cowley;P. Sandholt
1986年12月1日，ISEE 1号和2号宇宙飞船在接近EISCAT雷达、光度计和斯瓦尔巴群岛上的一台全天照相机视野的电离层场线脚点的位置穿过日侧磁层顶。磁鞘磁场向南、向暗，在ISEE位置观测到通量传递事件（FTEs）。同时，EISCAT雷达观测到电离层流爆发高达1 km s−1。每次爆发的峰值都是在ISEE的FTE观测之后几分钟出现的。每次爆发持续十到十五分钟，先是向西的，然后是向极地的。新奥勒松的一架全天候摄像机观察到，在冰流爆发期间或之后不久，白天的极光分裂形成，向西移动，然后向极地移动。虽然这些气流爆发和相关的日侧极光形式先前已被报道与向南的IMF方向有关，但这是第一次观察到与磁层顶fte的直接联系。在这种情况下，与fte相关的推断电位的下限大约为10千伏。他们推断电离层的东西向范围在700至1000公里之间，对应于平均磁层顶的3 - 5 RE地方时范围。
On December 1, 1986 the ISEE 1 and 2 spacecraft pair passed through the dayside magnetopause at a location which mapped approximately to ionospheric field-line foot-points near the fields of view of the EISCAT radar and photometers and an all-sky camera on Svalbard. The magnetosheath magnetic field was southward and duskward at the time, and flux transfer events (FTEs) were observed at the ISEE location. At the same time, the EISCAT radar observed ionospheric flow bursts of up to 1 km s−1. The peak of each burst followed an FTE observation at ISEE by a few minutes. The bursts, each lasting ten or fifteen minutes, were comprised of first a westward then a poleward flow. An all-sky camera at Ny Alesund observed dayside auroral breakup forms during or shortly after the flow bursts, moving westward then poleward. While these flow bursts and associated dayside auroral forms have been previously reported in association with southward IMF orientations, this is the first observation of a direct link to FTEs at the magnetopause. On this occasion, the lower limit on the inferred potential associated with the FTEs is roughly 10 kV. Their inferred east-west extent in the ionosphere ranges between 700 and 1000 km, corresponding to a 3 – 5 RE local time extent at the average magnetopause.