A comparison of magnetic disturbance at different stations

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Abstract
A brief discussion of the magnetic records obtained during the MacMillan Baffin Island Expedition of 1921–22 is given with comparison of results from several other well‐distributed observatories. For comparison a short, well‐defined, world‐wide magnetic storm (March 14, 1922) was selected, and departures from normal values were compiled and compared by three methods: (1) Difference between the disturbed and normal total‐intensity vectors; (2) excess energy of the magnetic field due to the disturbance; (3) magnetic activity proposed by Chree, using absolute daily ranges in three rectangular components of the total magnetic intensity. It is concluded that the geographic distribution of magnetic activity during disturbance bears a close relation to the auroral zone, and there is evidence that the zone of maximum auroral frequency is also a zone of maximum magnetic activity. If we take average values of the disturbance‐vectors over several months, there is a marked regularity in their directions for the individual stations, and for all stations the general direction of the horizontal‐intensity disturbance‐vectors is southward. This indicates that the disturbing currents in the upper atmosphere flow in general from east to west around the Earth.

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