You are on the Sudden Ionospheric Disturbances Monitoring Station A118 website. Welcome!

The solar flares release energy that affect the near Earth environment and particularly a part of the atmosphere called ionosphere.

Through monitoring of the propagation of radio communication signals, this station aims at detecting some of the ionospheric effects resulting from solar flares. Those effects are known as Sudden Ionospheric Disturbances, or SIDs.

This station is an amateur observatory located in France. Operational since early 2006, it has received the AAVSO observer code A118 in July 2006 and provides data to a coordinated network of observers around the world.

This website gives you access to real time measurements collected by the station and to a database of SID events observed so far.

I have also include general and basic information related to ionosphere, and to Sudden Ionospheric Disturbances and their detection principle.

This website aims also at providing information for building your own station. The construction of the various parts is described: the VLF antenna, the VLF receiver and the data acquisition and processing software.

I hope you will enjoy this site. Comments and suggestions are more than welcome, so do not hesitate!

Latest News

Happy New Year 2015
01 Jan 2015 00:00 UTC
I wish you and your loved ones a peaceful and Happy New Year!
GOES data availability
30 Dec 2014 09:05 UTC
After SWPC has updated the structure and content of their website, GOES x-ray flux and events were no longer shown. They are now back.
SID receiver circuit boards are out of stock
30 Jun 2013 14:35 UTC
Production of another batch is not planned.
Fix of a bug in the data plot
11 May 2013 21:19 UTC
A problem in a script could limit the number of displayed data channels. This problem is now corrected and all nine channels can be shown on the same graph.
Update of the list of Time Stations
10 May 2013 17:50 UTC
The Time Signal Stations kml file (Google Earth) was updated with new stations.

[View News Archive...]

Creative Commons License SID monitoring station by Lionel LOUDET is licensed under a
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Last Update: 16 Jun 2013 Visitors Today:
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