THE SOUTH MAGNETIC POLE
The Earth’s magnetic field influences many things, including compass navigation. Louis Bernacchi’s magnetic survey helped scientists better understand its action in Antarctica.
The magnetic field revolves around two polar points and Bernacchi was able to identify the true location of the South Magnetic Pole in February 1900. The expedition had hoped to reach the South Magnetic Pole by land but had to be content with demonstrating its location scientifically.
The South Magnetic Pole moves about 15 km a year and is different to the Geographic South Pole.
Under Louis Bernacchi’s leadership, the Southern Cross team collected a full year of weather readings. For the first time, scientists could track the seasonal variations in Antarctic sunshine, temperature and wind. Their data set the baseline for Antarctic climate science.
This chart from the Campbell-Stokes Sunshine Recorder indicates that the sun shone for 6.75 hours at Cape Adare on 5 October 1899.
Animal, fish and insect specimens were collected in the warmer seasons. They were skinned, preserved and mounted, intended for research collections in European museums. Unfortunately, many of the specimens were in poor condition by the time they reached London. A number of Nicolai Hanson’s notebooks were also lost after his death, undermining the value of the expedition’s significant zoological work.
Fishing revealed new species for science, as well as supplementing the men’s diet.
This anemograph was used by the Northern Party of Captain Robert Falcon Scott's Terra Nova expedition to measure the wind speed at Cape Adare. The Southern Cross team used similar equipment, but theirs was destroyed by the force of the winds they encountered. Louis Bernacchi recorded gales on 72 days during the 11 months they spent at Cape Adare.
Over the years, the wind has destroyed the tents of numerous explorers, as well as transporting huge chunks of ice and the contents of entire small lakes around the beach. The Cape Adare wind has also eroded up to half the thickness of some of the timber boards on Carsten Borchgrevink’s huts.