by Tony Hurst
Perhaps the most spectacular signs of the earth’s magnetic field in New Zealand are the streaming lights of the aurora australis in the night sky. Less visible phenomena have also been carefully documented in the region – from Captain Cook’s measurements in 1770, to the unusual rocks noted around Nelson in the 1850s, to magnetic storms monitored at the Eyrewell observatory today.
Main image: Aurora australis, Bluff Harbour
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