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Magnetic fields created by a dc-electrified railway are a nuisance to the operation of a geomagnetic observatory and also disturb other electromagnetic studies. Theoretical formulas that enable… (More)
The purpose of this study is to investigate the feasibility of deriving the traditionalK index from magnetograms plotted from recorded digital data. Digital magnetic data from Ottawa Observatory are… (More)
Space weather effects on the ground are produced by magnetic field changes associated with electric currents resulting from the solar wind/magnetosphere interaction. For most ground events the… (More)
THE effects of solar eclipses on the geomagnetic field have been summarized by Matsushita1. On quiet days clear changes in the geomagnetic field were seen superimposed on the Sq variation by Egedal… (More)