Planets and solar activity

Details Planets and solar activity Planets and solar activity

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978c%26t....94...19m&link_type=abstract

Ciel et Terre, vol. 94, Jan.-Feb. 1978, p. 19-27. In French.

Physics

Planetary Gravitation, Solar Activity, Solar Cycles, Tides, Jupiter (Planet), Solar System, Sunspots

Scientific paper

Dauvillier's (1977) explanation of the periodicity of solar activity is criticized. According to this explanation, tidal effects of planets on the sun are responsible for the creation of sun spots, and their number at cycle maximum is proportional to the distance between the solar system's center of gravity and the sun. In the present examination of data for 20 cycles (starting in 1750), this correlation is found valid only for the last five cycles (1928 through 1969). The suggested correlation between small size of the heliocentric sector containing the major planets at maximum and the solar activity is rejected on the basis of historical data. Calculations are presented that indicate that Jupiter's gravity would cause a tidal bulge on the sun of a half-millimeter at most.

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