Open Access

Table 1.

Received Navy stations, their location and frequency of the VLF signals.

Frequency (kHz) Call sign Latitude Longitude Distance (km) Max. obscuration at mid-reflection Max. amplitude (dB) Time of max. signal fluctuation
37.5 NRK 63.85 −22.47 2322.95 09:42 UT 97.0% 6.66 09:42 UT
57.4 GXH 58.59 −3.63 1186.77 09:43 UT 87.6% 7.97 09:43 UT
81.0 GYN 53.83 −2.83 1048.66 09:40 UT 84.1% 6.55 09:42 UT
63.85 FTA63 48.54 2.58 907.08 09:39 UT 77.3% 1.61 09:45 UT
62.6 FUG 43.39 2.10 1369.29 09:34 UT 73.1% 3.98 09:45 UT
26.7 TBB 37.41 27.32 2084.28 09:53 UT 51.2% 1.16 09:56 UT

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.