Essential features of the 11-year solar cycle

Details Essential features of the 11-year solar cycle Essential features of the 11-year solar cycle

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...51..175g&link_type=abstract

Solar Physics, vol. 51, Jan.-Feb. 1977, p. 175-183.

Physics

75

Solar Activity Effects, Solar Cycles, Sunspots, Twenty-Seven Day Variation, Auroras, Magnetic Disturbances, Solar Flares, Spectroheliographs

Scientific paper

It has been confirmed that the 11-year solar cycle consists of two maxima having different features. During the first maximum, solar activity increases in all heliographic latitudes but is maximal at a latitude of 25 deg in each hemisphere; far UV radiation, and the number of small spots, flares, and geomagnetic disturbances with sudden commencements are maximal at this time. During the second maximum, which appears two to three years after the first one, the activity is maximal at latitudes of plus or minus 10 deg. This is the time of occurrence of the biggest spots, big flares, auroras, and geomagnetic disturbances with gradual commencements and a long series of 27-day recurrences.

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