The estimation of K-indices by computer using a data-adaptive filtering technique

Details The estimation of K-indices by computer using a data-adaptive filtering technique The estimation of K-indices by computer using a data-adaptive filtering technique

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..611h&link_type=abstract

(International Union of Geodesy and Geophysics, General Assembly, 19th, Vancouver, Canada, Aug. 1987) Annales Geophysicae (ISSN

Physics

Geophysics

4

Adaptive Filters, Computer Techniques, Geomagnetism, Indexes (Ratios), Magnetic Disturbances, Harmonic Analysis, Kp Index, Magnetic Variations, Solar Activity Effects

Scientific paper

The present computer method, which may be employed to either automatically or interactively determine the geomagnetic K-indices, is based on a modified data-adaptive filtering technique and regards the solar regular magnetic variation as a nonlinear drift in the magnetic data over a 24-hour period. The dynamic range of the low K-indices is very small for recordings made at the Magnetic Observatory, Hermanus; the computer is capable of detecting smaller variations than would be possible with hand-scales magnetograms.

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