Long-term solar wind variations in the 20th-23rd solar activity cycles according to radio-astronomical data

Details Long-term solar wind variations in the 20th-23rd solar activity cycles according to radio-astronomical data Long-term solar wind variations in the 20th-23rd solar activity cycles according to radio-astronomical data

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ge%26ae..51...28v&link_type=abstract

Geomagnetism and Aeronomy, Volume 51, Issue 1, pp.28-38

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Scientific paper

We analyzed the variations of the interplanetary plasma parameters, obtained from radio astronomical observations of scintillations of cosmic radio sources during four 11-year cycles of solar activity, from 1966 to present. It is shown that the state of the interplanetary plasma permanently changes in conformity with cyclicity in the solar activity. In the studied time period, besides the 11-year variations in the velocity and scintillation index, there is also an increasing linear trend of these variables, which is presumably due to a secular 80-90-year cycle of solar activity. The observed differences between the 11-year variations and trends in the solar wind velocity and interplanetary scintillation index suggest that the 11-year and secular cycles have different origins. It is found that these trends occur in this time period in each link of the Sun-Earth system: in the solar activity indices, in the characteristics of the interplanetary medium, and practically in all characteristics of the geophysical, demographical, medical, and other Earth’s processes. From the entire set of facts we can conclude that most of the analyzed Earth’s processes are dominated not by anthropogenic factors, but by the effects of the secular cyclic processes of the solar activity.

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