Abstract
The long-term distribution of the Green Corona Low Brightness Regions (GCLBRFootnote 1) on the solar surface is investigated. The frequency curves of the GCLBR follow the solar cycle, but are displaced considerably relative to the curve of the sunspot number cycle. The observed displacement increases with the size of the GCLBR and reaches up to 4–5 years for the largest regions. It is, however, interesting that the displacement in the equatorial zone is opposite to that in the higher-latitude zones.
An older idea on the physical affinity between GCLBR and coronal holes led us to study the frequency of GCLBR and the properties of High-Speed Plasma Streams (HSPSFootnote 2) in the solar wind. Maximum velocity and duration of the coronal-hole-related HSPS seem to be well correlated with the number and size of GCLBR located in the N 60-N 20 and S 20-S 60 latitudinal zones. This is particularly evident at the end of the solar cycle.
Geophysical Kp and aa indices are used to demonstrate a possible genetic dependence of geoactivity on the size, position on the Sun's surface and frequency of the GCLBR. In this sense, the most pronounced period is 1973–1976.
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Notes
The abbreviations GCLBR and HSPS should be read in the plural throughout this paper.
The abbreviations GCLBR and HSPS should be read in the plural throughout this paper.
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Sýkora, J. The green corona, the solar wind and geoactivity. Sol Phys 140, 379–392 (1992). https://doi.org/10.1007/BF00146319
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DOI: https://doi.org/10.1007/BF00146319