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Reference:
A Kuritzky M.D, Y Zoldan M.D, R Hering M.D, E Stoupel M.D., Ph.D (1987)
Geomagnetic Activity and the Severity of the Migraine Attack
Headache: The Journal of Head and Face Pain 27 (2), 87–89.
This study could not support an increase in migraine attacks due to geomagnetic activity, but found a correlation between the severity and geomagnetic activity.
According to the researchers, "The severity of the headache however was linearly correlated with the level of GMA [Geomagnetic Activity], increasing from 25.9% of severe headaches in days with quiet GMA to 43.75% of severe headaches in days with stormy GMA."
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G. De Matteis, M Vellante, A Marrelli, U Villante, P Santalucia, P Tuzi, M Prencipe (1994)
Geomagnetic Activity, Humidity, Temperature and Headache: Is, There Any Correlation?
Published in: Headache: The Journal of Head and Face Pain 34 (1), 41–43.
Researchers studied the relationship between the migraine triggers of 40 patients and meteorological elements such as humidity, temperature and geomagnetic activity. They recorded the meteorological data and frequency changes of geomagnetic activity and compared them with the onset and severity of the migraine attacks.
The researchers concluded: "Our results indicate a significant correlation between geomagnetic activity and migraine attack frequency." They also admit, however, that further studies are required to support their findings.