Correlation of substorm injections, auroral modulations, and ground Pi2
Correlation of substorm injections, auroral modulations, and ground Pi2
复制标题
亚暴注入、极光调制和地面 Pi2 的相关性
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
J. Raeder
中科院分区：
文献类型：
--
作者：
A. Keiling;V. Angelopoulos;D. Larson;R. Lin;J. Mcfadden;C. Carlson;J. Bonnell;F. Mozer;K. Glassmeier;H. Auster;W. Magnes;S. Mende;H. Frey;A. Roux;O. Lecontel;S. Frey;T. Phan;E. Donovan;C. Russell;I. Mann;W. Liu;X. Li;M. Fillingim;G. Parks;K. Shiokawa;J. Raeder
在本案例研究中，我们报告了 2007 年 3 月 23 日的一次亚暴，它在三个亚暴现象中表现出周期为 ∼135 秒的振荡，所有这些现象都是一对一相关的。现场观测来自一艘 THEMIS 航天器（8.3 RE 地心距）和地球同步 LANL-97A 航天器。这里的重点是THEMIS与极光增亮区域共轭的强化阶段，其足点位于高纬度地面站Kiana附近。将演示以下结果：（1）THEMIS 和 LANL-97A（延时）记录的周期性离子注入（>100 keV）。 (2) 近共轭高纬度地面磁力计数据显示非常大的 Pi2 (δH∼150 nT)，与 THEMIS 离子注入相比有 6 s 的时间延迟。 (3) 低纬度地面磁力计数据也显示 Pi2 与高纬度 Pi2 的波形相同，但延迟时间较长（20~31 s）。 (4) 极光光度在增强阶段周期性调节。 (5) 所有三个特征（离子注入、接地 Pi2、光调制）具有相同的周期 ∼135 s，但相对于 THEMIS 离子注入有不同的时间延迟。这些观测表明，这三个亚暴现象有一个控制周期性的共同来源。
In this case study we report a substorm, 23 March 2007, which exhibited oscillations with a period of ∼135 s in three substorm phenomena all of which were one‐to‐one correlated. The in‐situ observations are from one THEMIS spacecraft (8.3 RE geocentric distance) and the geosynchronous LANL‐97A spacecraft. The focus here is on the intensification phase during which THEMIS was conjugate to the region of auroral brightening and its foot point was near the high‐latitude ground station Kiana. The following results will be demonstrated: (1) THEMIS and LANL‐97A (time‐delayed) recorded periodic ion injections (>100 keV). (2) Near‐conjugate high‐latitude ground magnetometer data show very large Pi2 (δH∼150 nT) with a 6‐s time delay compared to the THEMIS ion injections. (3) Low‐latitude ground magnetometer data also show Pi2 with the same waveform as the high‐latitude Pi2 but with longer time delays (20–31 s). (4) Auroral luminosity was periodically modulated during the intensification phase. (5) All three signatures (ion injections, ground Pi2, optical modulation) had the same periodicity of ∼135 s but with various time delays with respect to the THEMIS ion injections. These observations demonstrate that the three substorm phenomena had a common source which controlled the periodicity.