Substorm associated changes in the high‐latitude ionospheric convection
Substorm associated changes in the high‐latitude ionospheric convection
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亚暴相关的高纬度电离层对流变化
DOI：
10.1029/2003gl017497
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发表时间：
2003
影响因子：
5.2
通讯作者：
J. St.‐Maurice
中科院分区：
文献类型：
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作者：
P. Jayachandran;J. MacDougall;E. Donovan;J. Ruohoniemi;K. Liou;D. Moorcroft;J. St.‐Maurice
利用位于极冠内的加拿大先进数字电离层探测仪（CADIs）和SuperDARN雷达，在稳定和长时间向南的IMF Bz条件下，对极冠/极冠向阳面对流对亚暴间隔的响应进行了研究，研究表明：（1）在亚暴开始之前，极冠/极冠向阳面对流速度逐渐延长下降;（2）亚暴开始后，对流突然减少;（3）亚暴恢复阶段对流增强。我们假设，观测到的对流特征是由于与亚暴相关的区域1电流系统的调制。地磁仪位于极冠内的地面磁响应至少与我们的假设一致。
A study of polar cap/dayside convection response to substorm intervals using Canadian Advanced Digital Ionosondes (CADIs), situated well within the polar cap, and SuperDARN radars during steady and prolonged southward IMF Bz conditions showed three distinct features: (1) gradual prolonged decrease of dayside/polar cap convection speed until the substorm onset; (2) sudden decrease of convection following the onset of the substorm; and (3) increase of convection during the recovery phase of the substorm. We hypothesize that the observed features of the convection are due to the modulation of the Region 1 current system associated with the substorm. The ground magnetic response of magnetometers situated inside the polar cap is at least consistent with our postulate.