Abstract
The dynamics of several heliophysical and atmospheric processes were compared with 12.175- and 4.06-day biorhythms observed earlier in the mitotic activity of epithelial tissues and glucocorticoid hormone concentrations in mammals and birds. A 12.175-day period was detected in sign reversals of the mean solar magnetic field and sharp drops in atmospheric pressure. A 4.06-day period was discerned in changes from plus to minus of interplanetary magnetic-field (IMF) sectors, but only during a solar maximum, which is the period of the greatest Solar activity during an 11-year solar cycle. Similar 4.06-day periods were observed in the dynamics of atmospheric pressure and averaged daily air temperature regardless of the phase of solar activity, but only from January through April and from July through October. The studied heliophysical and atmospheric processes are synchronous in terms of the 12.175- and 4.06-day biorhythms. However, the processes lack a direct relationship because the periodicities are detectable only at certain time intervals, while the biorhythms are equally detectable in all seasons of the year and all phases of the solar cycle.
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