spase://SMWG/Instrument/SipleExperiment/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.