Multipoint observations of a dayside transient event
Multipoint observations of a dayside transient event
复制标题
白天瞬态事件的多点观测
DOI：
10.1029/93ja02272
复制
发表时间：
1994
影响因子：
--
通讯作者：
D. Sibeck
中科院分区：
文献类型：
--
作者：
H. Vo;J. Murphree;R. Elphinstone;R. Elphic;E. Friis;H. Lühr;D. Sibeck
磁层顶可能会发生许多不同的过程。为了区分各种机制，需要在白天磁层中同时进行多点观测。 1986年9月23日，位于太阳风、磁层顶、地球同步轨道和极轨道的多个航天器进行了此类重合观测。从世界标准时间1110开始，IMF的Bz分量经历了3个周期周期，每个周期约7分钟，并且有4个周期为10分钟的太阳风压力脉冲，由IMP 8记录。 卫星。 ISEE 卫星对在世界标准时间 1125 年接近当地正午时穿过磁层顶，并在世界标准时间 1115 和 1120 年记录了磁场正常分量中的两个双极事件。此外，ISEE 1 在 1118 UT 观察到双极事件，而 ISEE 2 没有观察到。随后在黎明区的地球同步轨道上观察到磁场的周期性振荡和压缩。位于早间区域的格陵兰磁力计站记录了对太阳风压力脉冲的瞬态响应。东海岸站（接近当地中午）在 1122 UT 显然观察到了不同的涡流。维京极光图像显示，在 1122 UT 的白天极光分布的极地局部特征被激活。世界标准时间 1128 时下午区域出现极光增强，以 5 km s−1 的速度向东移动，并在世界标准时间 1141 时强度减弱。在该激活的赤道方向可以看到清晰的 Pc 5 脉动。原位测量和电离层对两次双极事件的响应的差异得出的结论是，1118 UT 事件可以解释为与磁层顶运动同时的重新连接有关。
Many different processes may take place at the magnetopause. To distinguish the various mechanisms requires simultaneous multipoint observations in the dayside magnetosphere. Such coincident observations were made by a number of spacecraft located in the solar wind, at the magnetopause, at geosynchronous orbit, and at polar orbit on September 23, 1986. Beginning at 1110 UT, the Bz component of the IMF underwent three periodic cycles, each with a duration of about 7 min, and there were 4 solar wind pressure pulses with a period of 10 min, as recorded by the IMP 8 satellite. The ISEE satellite pair crossed the magnetopause near local noon at 1125 UT and recorded two bipolar events in the normal component of the magnetic field at 1115 and 1120 UT. In addition, ISEE 1 observed a bipolar event at 1118 UT that ISEE 2 did not. Periodic oscillations and compressions of the magnetic field were then subsequently seen at geosynchronous orbit in the dawn sector. Greenland magnetometer stations also located in the morning sector recorded transient responses to the solar wind pressure pulses. The East Coast stations (near local noon) apparently observed a different vortex at 1122 UT. Viking auroral images show an activation of a localized feature poleward of the dayside auroral distribution at 1122 UT. An auroral enhancement, seen at 1128 UT in the afternoon sector, moved eastward at a speed of 5 km s−1 and decayed in intensity by 1141 UT. Clear Pc 5 pulsations were seen equatorward of this activation. Differences in both in situ measurements and ionospheric responses to the two bipolar events lead to the conclusion that the 1118 UT event can be interpreted as being associated with reconnection at the same time that the magnetopause was in motion.
ISEE磁力计网络
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--