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Are you suggesting this because you have some knowledge of the field and are aware that this work hasn't been done? It seems like if it were so simple someone might have taken a look. Magnetic analyses of rock deposits are after all how we know about things like the timing and frequency of magnetic pole flips.

The Carrington event lasted about 2 weeks. How much silt is deposited in that time?

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I suspect it hasn't been done because there was no obvious value to such data, and the effort of figuring out the precise position and magnetic orientation of trillions of iron particles would be pretty high...

Lloyd’s of London is a large insurer and is very interested in the potential liability that they are exposed to from the various insurance policies that they’ve underwritten.

In 2013, they published a report[0] considering the effects of solar storm risk to the North American electric grid.

tldr; it’s all about the transformers

[0] - https://assets.lloyds.com/assets/pdf-solar-storm-risk-to-the...

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