Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70..173l&link_type=abstract
Solar Physics, vol. 70, Mar. 1981, p. 173-195.
Physics
49
Magnetic Storms, Solar Activity Effects, Solar Cycles, Solar Terrestrial Interactions, Sunspot Cycle, Equatorial Atmosphere, Magnetoactivity, Solar Wind, Sudden Storm Commencements, Transient Response, X Ray Imagery
Scientific paper
Solar cycles are examined through both stream and shock events using 110 years of sunspot numbers and indices of geomagnetic activity with 17 years of solar wind data. A unified scheme of solar activity evolution is proposed in which the solar cycle starts every eleventh year with a total duration of 17 or 18 years. During an interval of 6-7 years two successive cycles with unrelated levels of activity are evolving simultaneously at different latitudes on the sun in different phases of evolution. From polar field reversal to sunspot minimum, a phase of polar wind activity of the beginning cycle is superimposed on the weak contribution of the shock events of the ending cycle. An equatorial phase consisting mostly of shock events is then superimposed on the variable contribution of short-lived and sporadic equatorial stream activities. Finally, a phase of low-latitude shock events is superimposed on the polar stream interval of the following cycle.
Legrand Jean-Pierre
Simon P. A.
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