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 2019
01 Jan 2019 00:00 UTC
I wish you and your loved ones a peaceful and Happy New Year!
Happy New Year 2018
01 Jan 2018 00:00 UTC
I wish you and your loved ones a peaceful and Happy New Year!
Fix of some faulty website pages
05 Jan 2017 09:24 UTC
Thanks to those who informed me of some pages not showing properly. They are now fixed.
Update of solar activity page
01 Jan 2017 16:43 UTC
Solar activity data (sunspots, X-ray and optical flares, X-ray flux) are updated with 2016 data.
Happy New Year 2017
01 Jan 2017 00:00 UTC
I wish you and your loved ones a peaceful and Happy New Year!

[View News Archive...]

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Last Update: 16 Jun 2013 Visitors Today:
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