Concerning possible effects of ionospheric conductivity upon the occurrence patterns of impulsive events in high‐latitude ground magnetograms
Concerning possible effects of ionospheric conductivity upon the occurrence patterns of impulsive events in high‐latitude ground magnetograms
复制标题
关于电离层电导率对高纬度地面磁图脉冲事件发生模式的可能影响
DOI：
10.1029/96ja00072
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
G. Korotova
中科院分区：
文献类型：
--
作者：
D. Sibeck;R. Greenwald;W. Bristow;G. Korotova
先前的研究已经根据日侧磁层顶附近发生的瞬态过程解释了高纬度日侧电离层脉冲事件的发生模式。特别是，大多数脉冲地面磁力计事件发生在当地中午之前，这一事实被解释为磁层顶瞬态过程中黎明/黄昏不对称的证据。在本文中，我们试图提高社区的认识，即霍尔电导率的高纬度分布也会影响地面磁力计观测到的特征。特别是，我们将证明脉冲事件发生模式与报告的霍尔电导率统计模式具有惊人的相似性。我们建议在解释脉冲地面事件的发生模式时考虑这种相似性。
Previous studies have interpreted the occurrence patterns of impulsive events in the high‐latitude dayside ionosphere in terms of transient processes occurring near the dayside magnetopause. In particular, the fact that most impulsive ground magnetometer events occur prior to local noon has been interpreted as evidence for a dawn/dusk asymmetry in transient processes at the magnetopause. In this paper, we seek to raise the awareness of the community that the high‐latitude distribution of the Hall conductivity also influences the signatures observed by ground magnetometers. In particular, we will show that impulsive event occurrence patterns bear a striking resemblance to reported statistical patterns for the Hall conductivity. We suggest that this similarity be taken into account when interpreting occurrence patterns for impulsive ground events.