Fig. 9.

thumbnail

Download original image

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.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.