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Solar cycle 17: 1933 – Sep 5.8 1937 – Apr 199 96 3-7 10-5 Solar cycle 18: 1944 – Feb 12.9 1947 – May 219 109 3-3 10-2 Solar cycle 19: 1954 – Apr 5.1 1958 – Mar 285 129 3-11 10-6 Solar cycle 20: 1964 – Oct 14.3 1968 – Nov 157 86 4-1 11-5 Solar cycle 21: 1976 – Mar 17.8 1979 – Dec 233 111 3-9 10-6 Solar cycle 22: 1986 – Sep 13.5
Reconstruction of solar activity over 11,400 years. Sunspot numbers over the past 11,400 years have been reconstructed using carbon-14 and beryllium-10 isotope ratios. [10] The level of solar activity beginning in the 1940s is exceptional – the last period of similar magnitude occurred around 9,000 years ago (during the warm Boreal period).
Pre-Solar System Billions of years before the formation of the Solar System Over 4.6 billion years ago (bya) Previous generations of stars live and die, injecting heavy elements into the interstellar medium out of which the Solar System formed. [15] ~ 50 million years before formation of the Solar System 4.6 bya
This revolution is known as the Solar System's galactic year. [273] The solar apex, the direction of the Sun's path through interstellar space, is near the constellation Hercules in the direction of the current location of the bright star Vega. [274] The plane of the ecliptic lies at an angle of about 60° to the galactic plane. [c]
Solar cycle 25 is the current solar cycle, the 25th since 1755, when extensive recording of solar sunspot activity began. It began in December 2019 with a minimum smoothed sunspot number of 1.8. [ 2 ]
Because galactic cosmic rays are partially excluded from the Solar System by the outward sweep of magnetic fields in the solar wind, increased solar activity reduces 14 C production. [49] Atmospheric 14 C concentration is lower during solar maxima and higher during solar minima.
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