Studies conducted in the second half of the 20th century confirmed: the processes on the Sun that cause magnetic storms on the Earth are one of the main causes of cardiovascular diseases and blood pressure disorders. These diseases are the most common, and the mortality from them is greatest, amounting to 30−50% of the total number of diseases and deaths.
The systematization of data on unfavorable Sun activity and a complete description of the processes and changes in the organism that occur under the action of cosmic factors were described by scientists Y. Mizun and V. Khasnulin in the book "Magnetic storms and health" and other scientific works in the beginning of the 1980s. Thanks to their work, it became possible to develop a methodology for forecasting unfavorable days, as well as medical recommendations for the population.