Медицинская статистика по Москве показывает, что за 70% микроколебаний, вызванных геомагнитными возмущениями, следует повышенное количество сердечных приступов (на 13%) и (наверное) инсультов (на 7.5%). И такая хрень начинается за 24 часа до начала шторма.
Medical statistics for Moscow show that 70% of all micro variations, caused by geomagnetic disturbances, are accompanied by an abnormally high incidence of heart attacks (a growth of about 13%), and blood-strokes (7.5% growth). The low and extremely low frequency electromagnetic fields destabilize the heartbeat, leading to a sudden death or infarction. Medical experts have finally explained why heart attacks take a heavy toll before a magnetic storm - because micro variations begin 24 hours before the storm.
http://www.spacedaily.com/reports/Magnetic_Storms_Affect_Humans_As_Well_As_Telecommunications.html