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Power spectral analysis of auroral occurrence frequency
Power spectral analyses have been carried out on a data set of Swedish visual auroras for the period 1721 to 1943. Besides the anticipated 11-year, annual, and semiannual cycles, an unexpected peakExpand
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New interplanetary proton fluence model
A new predictive engineering model for the interplanetary fluence of protons with energies > 10 MeV and > 30 MeV is described. The data set used is a combination of observations made from the Earth'sExpand
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Summary of sky brightness measurements during eclipses of the sun.
A selected group of measurements of the sky brightness during total solar eclipses is used to determine a standard light curve during the period from no obscuration to totality. It is found that theExpand
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Low-latitude auroras: The great aurora of 4 February 1872
The aurora of 4 February 1872 was comparable to, and perhaps even greater than, that of 1/2 September 1859. In this paper we show that the aurora of 4 February 1872 was seen worldwide, and that inExpand
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Knowledge of solar variability and its effects on the Earth is essential since the Sun affects almost every aspect of our lives. Direct observations of the Sun, usually of sun- spots, with someExpand
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Low-latitude auroras: the magnetic storm of 14–15 May 1921
Abstract We review solar/geophysical data relating to the great magnetic storm of 14–15 May 1921, with emphasis on observations of the low-latitude visual aurora. From the reports we have gatheredExpand
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Comparison of the aurora of September 1/2, 1859 with other great auroras
Abstract The maximum equatorward boundary of a number of visual auroral events for the period subsequent to that of the great storms of August and September 1859 are examined. These boundaries, inExpand
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Low latitude auroras: the storm of 25 September 1909
Abstract Visual auroras at low latitudes are rare, documented for only five occasions since 1859. They are important from a theoretical point of view in terms of the lowest latitude at which particleExpand
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Abstract Early auroral observations from Europe and Asia, and catalogs of these observations, are described and discussed. Cautions to be aware of when using these data include the dating of theExpand
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On the behavior of airglow under the influence of gravity waves
Although the experimental observations of airglow intensity fluctuations and their possible connections with traveling ionospheric disturbances have been made by many investigators, very littleExpand
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