Welcome

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!

The origins...

Early 2005, a Sky & Telescope article mentioned the recording by an amateur astronomer of the effect of a GRB (Gamma Ray Burst) on the Earth ionosphere. This amateur was monitoring radio signals transmitted by VLF (Very Low Frequency) stations hundreds to thousands miles away.

As a child, I used to spend many hours in astronomy books or under the skies. Today, professional constraints impose me to live under light polluted skies and to be less and less available for watching the stars. The monitoring of SID (Sudden Ionospheric Disturbances) appeared to me as a good means to come back to astronomy and gave me the opportunity of discovering a whole new world...
Less than a year after reading the S&T article, after hundreds of hours surfing the web and seeking information, making the VLF receiver and writing software, the SID Monitoring Station was operational.

Latest News

Flares Identification
12 May 2012 14:35 UTC
The GOES measurement display is now enriched with a label for each flare. This feature can be removed in the GOES settings window.
Altering of the vertical range of the signal level plot
05 Feb 2012 19:40 UTC
A new slider is available in the option tab to alter the signal level plot vertical scale. Thanks to Anton for the suggestion.
Happy New Year 2012
01 Jan 2012 00:00 UTC
I wish you and your loved ones a peaceful and Happy New Year!
SID Monitor v1.3.1 Available
24 Apr 2011 08:45 UTC
Version 1.3.1 of SID Monitor is now available. This version fix a few minor bugs.
Description of SID receiver updated (v1.1)
23 Apr 2011 17:40 UTC
The SID receiver description has been updated. This new version (v1.1) adds a USB interface and some other new functionality.

[View News Archive...]

Creative Commons License SID Monitoring Station by Lionel LOUDET is licensed under a
Creative Commons Attribution-Noncommercial-Share Alike 2.0 France License.
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