Int. J. Environ. Res. Public Health 2010, 7 953 Figure 10. Distribution of Influenza Pandemics (according to different authors) as a function of phase offset from solar activity maximum. Data are normalized for a maximum of 100. The solar activity minimum lies at a phase offset of ±0.5. The activity maximum is at a phase offset of 0. The data from Garrett (1994) are shown in blue; those from Potter (1998) in violet. Sunspot Number is shown in red. (From [86], reproduced by the kind permission of Dr. Tapping). Solar cycles and geomagnetic field’s influences on human beings manifests not only through periodicity in global influenza infection spread. There are numerous observations supporting influence of the geomagnetic field perturbations on people’s health. Statistical analysis of hospital records showed that magnetic storms correlated with a significant rise of mental, nervous disorders and acute cardiovascular events (stroke and myocardial infarction) in urban populations [91,92]. Many authors noticed correlation between dynamics of immunological parameters in healthy people and Solar cycles: in years of maximum solar activity average leukocyte count decreased 1.5-1.67-times that in low solar activity phase and blood formula shifted towards lymphocytosis [93-95]. According to S. Tromp, solar activity may regulate human immunity; many years experience in donor blood examination allowed the researcher to conclude that the blood sedimentation rate varies with the sunspot cycle. Since this rate parallels the amount of albumin and gamma globulin, resistance to infection may also correlate with solar cycles [7]. All together, accumulated data support the idea about cycles of solar activity as the pacemaker of numerous biological phenomena including epidemics of some infectious diseases and dynamic changes in immunological parameters of living beings. As stated by Tapping and coauthors, “solar connection with pandemics may seem implausible at first sight; however solar modulation of many environmental parameters is now well established, and it is timely to revisit the issue of the connection between the occurrence of pandemics and the rhythm of solar activity” [86].