Responses of the basic cycles of 178.7 and 2402 yr in solar-terrestrial phenomena during the Holocene

Reconstructions of solar-terrestrial (ST) phenomena, in su cient quality, several thousands of years backward by means of radiocarbon ( 14 C), 10 Be or 18 O isotopes have been employed for study of possible responses of the ordered (trefoil) and disordered intervals (types) of the solar inertial motion (SIM) as well as of the 370 yr exceptional segments occurring in steps of 2402 yr in these phenomena. The trefoil intervals are about 50 yr long, and the Sun returns to the trefoil intervals always after 178.7 yr, on average. During interme- diate intervals the Sun moves along chaotic (disordered) lines. It was also found that very long (nearly 370 yr) intervals of the solely trefoil orbit of the SIM occurred in steps of 2402 yr. Such exceptional intervals occurred in the years 159 BC-208 AD, 2561-2193 BC, 4964-4598 BC, etc. A stable behaviour of ST phenomena during these long segments is documented. It was also found that the deepest and longest solar (temperature) minima (of Sporer or Maunder types) occurred in the second half of the 2402 yr cycle in accordance with the respec- tively most disordered types of the SIM. The SIM is computable in advance: the SIM comparable with that after 1873 is before us. Corresponding behaviours of ST phenomena can be expected.