On mid-term periodicities of high-latitude solar activity |
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Authors: | LH Deng B Li YY Xiang GT Dun |
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Institution: | 1. Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, PR China;2. Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Shandong University at Weihai, 264209 Weihai, PR China;3. University of Chinese Academy of Sciences, 100049 Beijing, PR China |
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Abstract: | The mid-term periodicities of polar faculae are studied separately for the total disk, northern and southern hemispheres of the Sun for a time interval from 1951 August to 1998 December. Apart from the 11-year Schwabe cycle which is the fundamental period and is found in all of the three time series, the following prominent results are found: (1) the rotational periodicity of solar activity at high latitudes is approximately from 28 to 32 days; (2) a large number of quasi-periods appearing in low-latitude solar activity (annual variation, 1.3–1.7 years, quasi-biennial oscillation, and 4–5 years) also exist in polar faculae; (3) the periodicities on both hemispheres are not identical. |
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Keywords: | Sun: faculae Plages &ndash rotation &ndash methods: data analysis |
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