Physics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42..121d&link_type=abstract
Solar Physics, vol. 42, May 1975, p. 121-130.
Physics
28
Chromosphere, Solar Cycles, Solar Flares, Sunspots, Calcium, Magnetic Effects, Northern Hemisphere, Phase Shift, Solar Activity, Solar Magnetic Field, Solar Rotation, Southern Hemisphere
Scientific paper
Observational data on sunspots, the 2800-MHz flux, and calcium plages are interpreted which were obtained during the declining phase of solar cycle 20. It is shown that three pulses of activity occurred during this period and resulted in two conspicuous 'stillstands' in the smooth means of the sunspot, 2800-MHz, and plage data. The longitudes of centers of sunspot and flare activity are found to have clustered in identifiable zones or hemispheres for relatively long periods of time. The sun is seen to have had a relatively inactive hemisphere centered about zero deg longitude, and certain well defined coronal holes were apparently located near the middle of this hemisphere. The first sunspot groups of cycle 21 are observed to have formed in the longitude zones associated with relatively high levels of activity during cycle 20.
Dodson Helen W.
Hedeman Ruth E.
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