Yearly Signal Level Graphs

Yearly graphs of the signal level measurements are available since 2006 for DHO38 (23.4kHz) and since 2010 for the other channels.

Graph of yearly VLF signal level
Creative Commons License SID monitoring station by Lionel LOUDET is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Last Update: 12 Jul 2014
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