Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49.1017w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Oct. 1987, p. 1017-1025.
Physics
7
Geomagnetism, Harmonic Analysis, Kp Index, Magnetic Variations, Data Sampling, Digital Techniques, Indexes, Pattern Recognition
Scientific paper
A numerical-data adaptive-separation method is developed for the discrimination of quasi-regular magnetic variations from the irregular variations for the determination of the K indices. The method is based on a pattern comparison and discrimination technique using harmonic analyses and is more objective than the hand-scaling method. The method is tested on digital data from the Canadian magnetic observatories Victoria, Meanook, and Ottawa over a 4-month period. The data are at a 10-s sampling interval and encompass the full range of K values (0-9). The two methods were found to agree about 97 percent of the time, with most errors occurring during very irregular periods. This is comparable with values carefully determined by highly skilled observers. It is proposed that the method is suitable for use on a regular basis.
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