The Differences in Geomagnetic Field Components between Observatories
Araki, T.
Abstract
In this paper, used data are Kp-indices and the daily mean values of each component of the geomagnetic field, observed at Memambetsu (Mb), Kakioka (Ka), Kanozan (Kn) and Kanoya (Ky) magnetic observatories. Secular variations are deducted from the daily mean values. The differences of the corrected daily mean values of each elements for three combinations of the observatories, Mb-Ka, Ka-Kn and Ka-Ky, are studied.
There are small changes of daily mean values due to the daily level of geomagnetic activity and the daily sum of Kp,-indices, ΣKp, are used as daily criterion of the activity for quantitative studies.
It seems that the differences of the daily mean value depend a little upon the corresponding ΣKｐ for all elements.
In the case of the horizontal intensity, the standard deviations of the differences from the yearly mean values depend upon the distance of the couple of observatories, while in the case of the other elements they do not.
But if the differences of 5-day-mean are used, the standard deviations from the yearly mean values depend upon the corresponding distance for all elements.
