Not flip­ping, as of now

Down to Earth - - SCIENCE -

THE EARTH'S ge­o­mag­netic field is not in dan­ger of flip­ping any­time soon. The re­searchers cal­cu­lated Earth's av­er­age, stable field in­ten­sity over the last five mil­lion years, and found that to­day's in­ten­sity is about twice that of the his­tor­i­cal av­er­age. This in­di­cates that the cur­rent field in­ten­sity has a long way to fall be­fore reach­ing an un­sta­ble level that would lead to a re­ver­sal. Pro­ceed­ings of the Na­tional Acad­emy of Sci­ences, Novem­ber 23

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