Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 27, 3601-3610, 2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
29 Sep 2009
Missing data and the accuracy of magnetic-observatory hour means
J. J. Love Geomagnetism Program, US Geological Survey, Denver, CO, USA
Abstract. Analysis is made of the accuracy of magnetic-observatory hourly means constructed from definitive minute data having missing values (gaps). Bootstrap sampling from different data-gap distributions is used to estimate average errors on hourly means as a function of the number of missing data. Absolute and relative error results are calculated for horizontal-intensity, declination, and vertical-component data collected at high, medium, and low magnetic latitudes. For 90% complete coverage (10% missing data), average (RMS) absolute errors on hourly means are generally less than errors permitted by Intermagnet for minute data. As a rule of thumb, the average relative error for hourly means with 10% missing minute data is approximately equal to 10% of the hourly standard deviation of the source minute data.

Citation: Love, J. J.: Missing data and the accuracy of magnetic-observatory hour means, Ann. Geophys., 27, 3601-3610, doi:10.5194/angeo-27-3601-2009, 2009.
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