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 shown on 10/5/2024 graph in particular. Due to my location, the trace go down on the graph during a SID. During the time of the aurora (seen over a period around 2300 on 10/5/2024 and again later in the night, my graph goes down to zero on the Y axis. Why is this? I wonder whether this is because the change in the ionosphere was so extreme that it saturated my detector.

Note in another location SIDs would go up – purely an effect of location on Earth.

Andy