Characteristics of a stable are based on FAST and MIRACLE observations
Characteristics of a stable are based on FAST and MIRACLE observations
复制标题
马厩的特征基于快速和奇迹的观察
DOI：
10.1007/s00585-000-0152-5
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Kauristie
中科院分区：
文献类型：
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作者：
P. Janhunen;A. Olsson;O. Amm;K. Kauristie
一个稳定的夜间部门进行了研究，从FAST卫星在1250公里的高度和奇迹地面网络，其中包括全天空相机，相干雷达（STARE），和磁强计的观测。FAST和STARE都观测到一个向北的电场区域，宽度约为200公里，弧以南的场强约为50 mV/m，这是一个典型的偶数扇区弧的特征。由FAST电子和磁力计数据确定的场向电流在弧内相当一致。在电弧之外，电子数据错过了向下FAC的载流子，可能是因为它主要由能量小于仪器阈值的电子携带。使用全天空照相机研究与弧形有关的小起伏向西传播的速度，得出的速度约为2公里/秒。这一速度比背景电离层等离子体速度（约1 km/s）高，但与Davis最初提出的起伏反映了加速区E × B运动的观点相一致。地面磁图显示，主电流在弧的稍南部流动。由FAST电子数据计算电离层电导率，并利用地面磁图估计电流，得到了与FAST结果相当一致的电离层电场图。
A stable evening sector are is studied using observations from the FAST satellite at 1250 km altitude and the MIRACLE ground-based network, which contains all-sky cameras, coherent radars (STARE), and magnetometers. Both FAST and STARE observe a northward electric field region of about 200 km width and a field magnitude of about 50 mV/m southward of the arc, which is a typical signature for an evening-sector arc. The field-aligned current determined from FAST electron and magnetometer data are in rather good agreement within the arcs. Outside the arcs, the electron data misses the current carriers of the downward FAC probably because it is mainly carried by electrons of smaller energy than the instrument threshold. Studying the westward propagation speed of small undulations associated with the arc using the all-sky cameras gives a velocity of about 2 km//s. This speed is higher than the background ionospheric plasma speed (about 1 km//s), but it agrees rather well with the idea originally proposed by Davis that the undulations reflect anE×Bmotion in the acceleration region. The ground magnetograms indicate that the main current flows slightly south of the arc. Computing the ionospheric conductivity from FAST electron data and using the ground magnetograms to estimate the current yields an ionospheric electric field pattern, in rather good agreement with FAST results.