Variability of dayside convection and motions of the cusp/cleft aurora
Variability of dayside convection and motions of the cusp/cleft aurora
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白天对流的变化和尖点/裂极光的运动
DOI：
10.1029/93gl00846
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
V. Davda
中科院分区：
文献类型：
--
作者：
M. Lockwood;J. Moen;S. Cowley;A. D. Farmer;U. Løvhaug;H. Lühr;V. Davda
我们用两台EISCAT雷达以10秒的分辨率测量了71-76°不变纬度范围内的电离层等离子体流，并用斯瓦尔巴群岛NY Alesund的子午线扫描光度计同时观测了630 nm的尖点/裂隙极光。跨极光电压从5千伏大幅增加到40千伏(与下午早些时候的向阳对流有关)是伴随着极光的南移，并与有规律的短暂极光分裂事件的开始相吻合。结果表明，这些观测结果与最近关于日侧磁层顶随时间变化的重联如何激发电离层流动的理论工作是一致的。
We present measurements of the ionospheric plasma flow over the range of invariant latitudes 71–76°, observed at 10-second resolution using both the EISCAT radars, with simultaneous observations of the 630 nm cusp/cleft aurora made by a meridian-scanning photometer at Ny Alesund, Svalbard. A major increase in the trans-auroral voltage from 5 to 40 kV (associated with sunward convection in the early afternoon sector) is found to follow a southward motion of the aurora and coincide with the onset of regular transient auroral breakup events. It is shown that these observations are consistent with recent theoretical work on how ionospheric flows are excited by time-dependent reconnection at the dayside magnetopause.