Even on a cloudy, rainy day I can "see" what's happening on the Sun......
This graph is from my Very Low Frequency (VLF) receiver, which monitors VLF transmitting stations around the world.
VLF is used by the Navy to communicate with submarines out at sea. The VLF signals not only penetrate water, but also bounce off Earth's ionosphere in order to travel around the world.
The ionosphere is affected by solar flares that erupt on the Sun and these flares create what is called Sudden Ionospheric Disturbances (SID).
The SID, in turn, affects the VLF signal and my receiver can detect these changes.
Attached, is a small portion of the plot from Oct. 30, showing a C-class solar flare. (The time on the plot is UTC, or Greenwich Mean Time).
The red numbers above the spike in the plot indicate the start/peak/end time, intensity and sunspot region where the flare occurred....
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