Interesting when the whole Guassian science was invented in 1835. Ability to measure to that quantitave degree just a few years later is historically phenomenal. Or BS. And your Wiki post is telling don't you think?
Well as we all know you can't trust blindly in Wikipedia So I don't know for sure about the 1600 nT, esp. also as my knowledge on Guassian science isn't exactly huge.
But I did find this:
1. ScienceDirect - Advances in Space Research : Dst of the Carrington storm of 1859
2. http://www.sciencedirect.com/scienc...serid=10&md5=6a4dbde5eb6607a6b1ccde06c5bb6edd
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