Experiences of a filter method and a standard curve method for determining K-indices

Details Experiences of a filter method and a standard curve method for determining K-indices Experiences of a filter method and a standard curve method for determining K-indices

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..589j&link_type=abstract

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

Physics

Geophysics

6

Geomagnetism, Indexes (Ratios), Computer Techniques, Histograms, Kp Index

Scientific paper

Two methods for determining K-indices by a computer were used for a high-latitude observatory, Sodankyla, a middle-latitude observatory, Nurmijarvi, and a low-latitude observatory, Kakioka, for the year 1983. The regular part S(R) is removed in different ways in the two methods. In the first, a filter is applied to the observations thus producing a smooth curve that is subtracted from the observed data, which were one-minute mean values in this work. In the second method, a standard curve is subtracted from the observations. Only the amplitude is varied by fitting the standard curve to the observations. At high latitudes the standard curve method is better, but both methods give satisfactory results there, which means about 70 percent zero-differences as compared to hand-scaled K-values and about 98 percent if a difference of one unit can be accepted. At Kakioka, the standard curve method does not work properly, and the filter method gives better results, 66 and 99 percent, respectively.

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