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1by Vajk, R.“.... A regional geomagnetic field was constructed. This regional magnetic field was used for computing...”
Published 1966
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2“...Recording of natural fluctuations of the geomagnetic field, in the frequency range .01 to 5 cps...”
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3by Fel'dshtein,Ya. I.“... hour. In deriving the Q-index, only the variations of the horizontal elements of the geomagnetic field...”
Published 1961
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