On the Characteristics of Geomagnetic Storms Observed During the Past 415 Years

In this paper we will present our investigations on the characteristics of geomagnetic storms deduced from direct and proxy observations for the years 1601-2016 AD. We show that we could infer epoch of reversal of solar polar magnetic fields from geomagnetic data. Such an inference is done back to the 18th century using geomagnetic and Aurora observations. We could also infer secular changes in the intensity of geomagnetic storms for the past 415 years.