Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140..379s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 140, no. 2, Aug. 1992, p. 379-392.
Physics
15
Brightness Distribution, Kp Index, Solar Corona, Solar Cycles, Solar Wind, Coronal Holes, Heliosphere, Iron
Scientific paper
The paper investigates the long-term distribution of the green corona low brightness regions (GCLBRs) on the solar surface. The frequency curves of the GCLBRs 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 GCLBRs and reaches up to 4-5 yr for the largest regions. The displacement in the equatorial zone is opposite that in the higher-latitude zones. The frequency of GCLBRs and the properties of high-speed plasma streams (HSPS) in the solar wind are studied. It is argued that maximum velocity and duration of the coronal-hole-related HSPS are well correlated with the number and size of GCLBRs 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 GCLBRs. In this sense, the most pronounced period is 1973-1976.
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