Automatic K scaling by means of fractal and harmonic analysis

Details Automatic K scaling by means of fractal and harmonic analysis Automatic K scaling by means of fractal and harmonic analysis

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..597d&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 8, Aug. 1992, p. 597-602.

Physics

4

Computer Programs, Fractals, Harmonic Analysis, Magnetic Disturbances, Magnetic Variations, Geomagnetism, Magnetosphere-Ionosphere Coupling, Minimax Technique, Solar Corpuscular Radiation

Scientific paper

The K index indicates the level of magnetic perturbation with respect to the normal diurnal variation. Usually K is taken manually from magnetograms, and the involved operations are consequently rather subjective. When data are available in digital form, it is possible to derive the K index automatically, using computer algorithms. This work applies a new combined technique based on both fractal and harmonic analyses. While the latter is often used in K determination, the former provides a substantially novel approach. One year (1989) of K observations at L'Aquila observatory has been used as a basis for comparison between hand and computer estimations of K. Agreements which have been found are comparable with those expected from two different operators.

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