Modulation of the solar daily geomagnetic variation

Details Modulation of the solar daily geomagnetic variation Modulation of the solar daily geomagnetic variation

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..115d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, Feb. 1986, p. 115-130.

Physics

1

Diurnal Variations, Geomagnetism, Magnetic Variations, Solar Terrestrial Interactions, Annual Variations, Fourier Analysis, Harmonic Analysis, Least Squares Method, Solar Cycles, Time Series Analysis, Weighting Functions

Scientific paper

A least squares spectral analysis is used to investigate cyclic and seasonal changes of the harmonic coefficients of the solar daily and semi-diurnal variation over the 24 year interval from January 1, 1960 to December 31, 1983 at a single magnetic observatory (Dourbes, Belgium). As a preparation for the treatment of other long runs of observations a statistical method is presented to combine the output of the spectral and harmonic analyses of a group of stations. The annual means of the Fourier coefficients are significantly correlated with the solar cycle. The spectra show peaks at periods of 11 years, 1 year, 6 months and 27 days, which entails an important amplitude and phase modulation of the daily and semi-diurnal variation. No simple relationship between the peaks in the broad solar rotation band can be proposed.

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