Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..856s&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 11-12, p. 856-860.
Physics
1
Geomagnetism, Magnetic Variations, Power Spectra, Kp Index, Solar Terrestrial Interactions
Scientific paper
It is argued that power spectral density is a more efficient statistic for measurement of magnetic activity than the K index. A preliminary investigation of the relationship of the power in magnetic activity fluctuations to the K index has been carried out using 1-min values of the horizontal intensity and declination at Hartland for 1989, for night-time 3-h intervals. This has shown that using values for individual intervals, the correlation between total power and K index is poor; some reasons are given for this. Over all intervals, the variation of average power with K is nearly linear and well correlated, however. It is found that the K index correlated better with low-frequency power than high-frequency power. A study of the power spectrum has shown that the spectral slope is steeper for larger values of K, and that the increase of power with K index is greater at low frequencies than high.
Dickinson J. A. M.
Kerridge D. J.
Lancastle G. R.
Schlapp D. M.
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