Abstract
DIFFICULTIES are certainly associated with the preparation of observational auroral frequency-lines. In general, some of the most important ones are supposed to be those due to too low density of the observational net, individual variations among the observers with regard to observational scheme and definitions, variations of the sensitivity of observational method, etc. Correction for variation of the solar activity over the observational periods for the different observers must be introduced. In addition to this, adjustments for cloud and daylight must be made, as mentioned by Dr. Stagg.
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HULTQVIST, B. Auroral Frequency Lines. Nature 184, 263 (1959). https://doi.org/10.1038/184263a0
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DOI: https://doi.org/10.1038/184263a0
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