Physics
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1173f&link_type=abstract
Planetary and Space Science, vol. 22, Aug. 1974, p. 1173-1184.
Physics
7
Geomagnetism, Interplanetary Magnetic Fields, Magnetic Effects, Solar Activity Effects, Cross Correlation, Diurnal Variations, Harmonic Analysis, Power Spectra, Spectrum Analysis
Scientific paper
Inferred solar sector polarity given by the AC index of Svalgaard, has been intensively studied as a single time series and as a time series correlated with geomagnetic and solar activity. Power auto-spectra of the AC index yield a highly significant harmonic series with fundamental at 27 days period and possessing clear harmonics up to the sixth; and a very prominent peak at a period of 1 yr. The 27-day harmonic series clearly indicates the solar control of the index, while the 1-yr period might be taken as confirmation of the work of Rosenberg and Coleman (1969) to the effect that the sector pattern observed on earth depends upon earth's heliographic latitude which has a 1-yr period. Cross-correlation analysis and superposed-epoch analysis are used to show that sectors inferred to be positive or away are associated with low geomagnetic and solar activity, whereas sectors inferred to be negative or toward exhibit significantly enhanced geomagnetic and solar activity.
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