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SYNOPSIS

Thirty patients suffering from either classical or common migraine recorded the dates of their headaches and their severity. A total of 486 attacks in fourteen months were recorded. Daily Geomagnetic activity (GMA) was obtained and graded to four levels of activity. No correlation was found between the frequency of the migraine attacks and the degree of GMA. The severity of the headache however was linearly correlated with the level of GMA, increasing from 25.9% of severe headaches in days with quiet GMA to 43.75% of severe headaches in days with stormy GMA.