[Lowfer] SID

[Garry]

News reports indicate a coronal mass ejection might reach earth on 
Monday. Monitoring VLF signal levels in advance of that show a sudden 
ionospheric disturbance (SID) around 1600Z and a weaker event around 
1830Z. This agrees with GOES x-ray observations 
(https://www.swpc.noaa.gov/products/goes-x-ray-flux) and NAA 
observations at Barnsboro, KY (http://moondog.astro.louisville.edu/). 
Here the 3 western stations monitored increased in strength while NAA to 
the east decreased.

73, Garry, K3SIW, EN52ta, Elgin, IL
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