The solar cycle

Astronomy and Astrophysics – Astronomy

Scientific paper

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Solar Cycles, Solar Magnetic Field, Sunspots, Coronal Holes, Cosmic Rays, Interplanetary Magnetic Fields, Particle Flux Density, Solar Prominences, Solar Radio Emission, Solar Wind

Scientific paper

The discovery of the solar cycle and current theories of its mechanisms are reviewed. The 11-yr cycle first observed by Wolf and Schwabe is characterized as a periodic phenomenon of variable duration and amplitude, and the data on the relative number of sunspots, the 10.7-cm radio flux, and the relationship of the solar cycle and changes in the cosmic-ray flux reaching the earth's surface (as reflected in C-14 levels) are summarized. The 22-year cycle proposed (on the basis of the cyclic evolution of the complex solar magnetic field) by Hale, Nicholson, and Spoerer is discussed, with consideration of spots, filaments, and coronal jets; coronal troughs, the solar wind, and the interplanetary magnetic field; and the proposed model of the solar field.

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