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Auroral Frequency Lines


IN his recent letter, Dr. B. Hultqvist1 compares lines of equal auroral frequency drawn by E. H. Vestine and by C. W. Gartlein with auroral frequency lines deduced theoretically. He finds that his lines agree better with Gartlein's International Geophysical Year data in that both sets bulge much farther south of the geomagnetic latitude circles over north east America than do Vestine's lines which were based on a combination of the original Fritz data with those collected in the years 1872–1942.

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  1. Hultqvist, B., Nature, 183, 1478 (1959).

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STAGG, J. Auroral Frequency Lines. Nature 184, 262–263 (1959).

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