Ground Waves and Sky Waves in Sudden Ionospheric Disturbances (SIDs)
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From John at SARA Feb 2025: Hello, The signals that we receive consist of a ground wave and a sky wave, the sky wave being reflected / refracted by the…
VLF Radio Detection of SIDs (Very low Frequency detection of Sudden Ionospheric Disturbances)
LRO SID Monitoring graphs at 23.4KHz from 10-11/5/2024 when the aurora was seen in my garden Lichfield, UK
The graphs below show my graphs from these two days – the incredible aurora with the crown visible overhead came from an enormous sunspot group. There are many large SIDs…
Some examples of Sudden Ionospheric Monitoring Disturbance (SID-Monitoring) graphs from around the time of the visible aurora in Lichfield, UK, May 2024
The traces below show some SID-monitoring traces at very low frequency radio (23.4KHz) , demonstrating multiple large SIDs around the date of the incredible visible aurora borealis seen throughout the…
Large M1.0 Solar Flare detected at LRO 19/4/2024
Using UKRAA Sudden Ionospheric Disturbance Monitor (SIDs). (See https://sidstation.loudet.org/ionosphere-en.xhtml for more information on SIDs). 23.4KHz.
Stack of Mini-PCs at Lichfield Radio Observatory (LRO)
I am using one mini-PC for each radio astronomy experiment at LRO = these 2nd hand PCs are cheaply available on ebay.
Sudden Ionospheric Disturbance (SID) Monitors
SIDs are changes in the ionosphere total power detected when solar flare hits the atmosphere. The power is detected from Very Low Frequency (VLF) radio signals travelling through the ionosphere.…
When there is too much gain on VLF SID Receiver!
I am grateful to the help of Andrew Thomas yesterday for helping me to tune my very low frequency (VLF) radio receiver, which I use to detect solar flares hitting…