Solar activity and the solar wind. I - Eleven-year cycles

Physics – Space Physics

Scientific paper

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Magnetospheric Instability, Solar Activity, Solar Wind Velocity, Sunspot Cycle, Corpuscular Radiation, Energy Dissipation, Geomagnetism, Radiant Flux Density, Solar Activity Effects, Solar Cycles

Scientific paper

The paper examines the apparently absent or weak correlation between variations in solar-wind properties and the 11-year period of the sunspot cycle. The discovery of the 11-year sunspot cycle is reviewed, its relationship with geomagnetic activity is illustrated, and previously proposed relationships between solar-wind velocity and solar-activity cycle (i.e., variations in the intensity of solar corpuscular radiation) are discussed. Results of spacecraft observations are summarized which indicate that large systematic changes in the parameters describing the basic flow of solar wind have not been detected during the rising portion of the present solar cycle. It is concluded that the modulation in magnetospheric energy dissipation inferred from large changes in geomagnetic activity during the solar cycle cannot be explained as a direct response to changes in solar-wind energy flux.

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