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Top panel: The change in amplitude of the North Dakota US Navy VLF transmitter signal received at Churchill (Canada) on a relatively undisturbed day (July 23, 2010) after the removal of a “quiet day curve” from the signal. Bottom panel: The change in amplitude of the North Dakota US Navy VLF transmitter signal received at Churchill (Canada) on August 4, 2010, after the removal of a quiet day curve from the signal. The red dots with error bars represent the mean and standard deviation of the amplitude perturbations for each of the UT time zones identified by the shading, including those periods which involve sunrise and sunset on the propagation path.
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