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

Update of Solar Activity page
28 Feb 2016 09:42 UTC
Solar Activity plots are updated. They reflect now the new Sunspot Number scale that is in use since mid-2015.
Update of Events Reports
27 Feb 2016 23:31 UTC
Reports are updated with events images that were missing since a few months.
Happy New Year 2016
01 Jan 2016 00:00 UTC
I wish you and your loved ones a peaceful and Happy New Year!
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.

[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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