Possible periodicities of high-speed solar plasma

Details Possible periodicities of high-speed solar plasma Possible periodicities of high-speed solar plasma

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.141..233x&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 141, no. 2, Feb. 1988, p. 233-250.

Astronomy and Astrophysics

Astrophysics

10

Solar Flares, Solar Wind Velocity, Space Plasmas, Statistical Analysis, Coronal Holes, High Speed, Periodic Variations

Scientific paper

The variations with time of the frequency of occurrence of the high-speed solar plasma stream (HSPS) were investigated using satellite data published by Lindblad (1981). The data consist of HSPSs derived from coronal holes, solar flares, and other sources. The periodicity of high-speed solar plasma derived from solar flares was found to be about 11 years, i.e., similar to the 11-year period of solar activity, while the HSPS periodicity derived from coronal holes was about 16 years and of opposite phase to the former periodicity. There also exist short-term perods, 12 and 14 months for solar plasma derived from solar flares, and 36, 24, 12, 6, 4, and 3 months for solar plasma derived from coronal holes. It is noted that the HSPS period of 24 months could be related to the 2-year period of the sunspont number analysis by Shapiro and Ward (1962) for the period 1856-1955.

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