Geomagnetic and solar wind cycles, 1900-1975

Details Geomagnetic and solar wind cycles, 1900-1975 Geomagnetic and solar wind cycles, 1900-1975

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.6153f&link_type=abstract

Journal of Geophysical Research, vol. 87, Aug. 1, 1982, p. 6153-6162.

Physics

85

Geomagnetism, Solar Terrestrial Interactions, Solar Wind, Sunspot Cycle, Time Series Analysis, Coronal Holes, Correlation Coefficients, Interplanetary Magnetic Fields, Periodic Variations, Solar Flares, Solar Prominences

Scientific paper

Using a criterion based on sunspot number alone, the time series of the annual average has been decomposed into the two periodic functions R and I, which are nearly 180 deg out of phase and have closely related amplitudes. The R and I components are interpreted in terms of the solar wind, and it is found that the R component has a correlation coefficient of 0.85 with the number of sudden commencements per year and is due to sporadic or short lived solar wind sources such as solar flares, disappearing filaments and/or short lived coronal holes. The I component, upon comparison with annual average recurrence indices, is found to be due to long lived solar wind sources such as polar coronal holes.

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