Long-term variations in north-south asym
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Derek B. Swinson; Hisako Koyama; Takao Saito
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Article
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1986
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Springer
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English
โ 467 KB
We present a new set of data on relative sunspot number (total, northern hemisphere, and southern hemisphere), taken for the 37-yr period 1947 to 1983; this constitutes a particularly coherent and consistent set of data, taken by the same observer (Hisako Koyama) using the same observing instrument.