GEOMAGNETIC STORMS. “Six physiological parameters of cardio-vascular system of rabbits and ultrastructure of cardiomyocytes were investigated during two planetary geomagnetic storms. At the initial and main phase of the storm the normal circadian structure in each cardiovascular parameter was lost. The asynchronicity was growing together with the storm and abrupt drop of cardia activity was observed during the main phase of storm.” (1995).
http://www.ncbi.nlm.nih.gov/pubmed/8555294