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(Top) Locations from which aurora were observed (orange points) or geomagnetic measurements were made (light blue points) during the peak of the great geomagnetic storm of 2 September 1859. Blue lines indicate geomagnetic latitude and gray shading indicates local night time. (Bottom) Latitude vs. time envelope of auroral observations (black lines), magnetometer records (orange), and telegraph disturbances (blue) for the 28 August and 2 September magnetic storms in 1859. The horizontal orange line at the bottom of the figure gives the timing of the September magnetic storm as observed at Colaba, near Bombay (now Mumbai) in India. (Adapted from Green & Boardsen 2006, with permission from Elsevier.)
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