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...
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...