Siple Experiment VLF

Receivers were set up at Siple station (75.93
deg. S, 84.25 deg. W geographic, corresponding to an invariant
latitude of 60.4 deg. S, at L = 4.2), and
near the geomagnetic conjugate point (first at Roberval, Quebec,
Canada (48.52 deg. N, 72.23 deg. W) and in 1986
near Lake Mistissini, Canada (50.42 deg. N, 73.87 deg. W)).
The receiver system consisted of two delta-shaped crossed loops
mounted on a central 30-foot-high(~9 m) support with a base of 60
feet (18.3 m). These two mutually perpendicular antennas could be
used for direction finding. In normal single-channel recording,
one antenna is selected for minimum power line interference. A
preamplifier at the base of the antenna boosts the received
signal to an appropriate level for transmission to the recording
equipment in the station. The receiving system includes provision
for time marks, amplitude and frequency calibration, and
automatic program control.
Accurate timing of transmitted and received
pulses were established by frequency standards at Siple and
Roberval. These standards were calibrated regularly against Station
WWV and are kept within a few milliseconds of UT.

Complete results of the Siple
station experiment are summarized in Helliwell, R. A.,(1988)
Rev. Geophys., 26, 551-578, but analysis
work on this dataset continued well after the experiment
ended. These data were originally stored on Ampex magnetic tapes
then converted over to a digitized format with some error
correction applied as described by Li et al., (2014) JGR, 119,1837-1850.

在斯皮尔站（地理坐标为南纬75.93度，西经84.25度，对应不变的纬度为南纬60.4度，L值为4.2）及地磁共轭点（最初位于加拿大魁北克的罗贝瓦尔（北纬48.52度，西经72.23度）以及1986年位于加拿大米斯蒂西尼湖附近（北纬50.42度，西经73.87度））附近设立了接收器。接收器系统由两个安装在中央30英尺高（约9米）、底座为60英尺（18.3米）的三角形交叉回路组成。这两个相互垂直的天线可用于测向。在正常单通道记录中，选择天线以最小化电力线干扰。天线底部的预放大器将接收到的信号提升至适合传输至站内记录设备的适当水平。接收系统包括时间标记、振幅和频率校准以及自动程序控制。通过斯皮尔站和罗贝瓦尔的频率标准建立了传输和接收脉冲的准确时间。这些标准定期与WWV站进行校准，并保持在与世界时相差几毫秒的范围内。斯皮尔站实验的完整结果由Helliwell, R. A.（1988）在《地球物理评论》第26卷第551-578页中总结，但对该数据集的分析工作在实验结束后仍持续进行。这些数据最初存储在Ampex磁带上，然后根据Li等（2014）在《地球物理研究杂志》（JGR）第119卷第1837-1850页中描述的方法转换为数字化格式，并应用了一些错误纠正。