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What does the Sun tell and hint now?
Li KJ(李可军)1,2; Li, KJ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2009-09
卷号9期号:9页码:959-965
DOI10.1088/1674-4527/9/9/002
产权排序第1完成单位
收录类别SCI
关键词Sun: Activity Sun: General Sunspots
摘要Some historical records, which have held since the beginning of modern solar activity cycles, are being broken by the present Sun: cycle 23 records the longest cycle length and fall time; latitudes of high-latitude sunspots belonging to a new cycle around the minimum time of the cycle are statistically the lowest at present, compared with those of other cycles; there are only one or no sunspots in a month appearing at high latitudes for 58 months, which is the first time that such a long duration has been observed. The solar dynamo is believed to be slowing down due to: (1) the minimum smoothed monthly mean sunspot number is the smallest since cycle 16 onwards, and even probably among all modem solar cycles; and (2) once the time interval between the first observations of two neighboring sunspot groups is larger than 14d, it should be approximately regarded as an observation of no sunspots on the visible solar disk, called a spotless event. Spotless events occur with the highest frequency around the minimum time of cycle 24, and the longest spotless event also appears around the minimum time for observations of the Sun since cycle 16. Cycle 24 is expected to have the lowest level of sunspot activity from cycle 16 onwards and even probably for all of the modem solar cycles.
项目资助者National Natural Science Foundation of China (NSFC) [10583032, 40636031] ; National Key Research Science Foundation [2006CB806303] ; Chinese Academy of Sciences
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
归档日期2009-10-09
WOS记录号WOS:000270404200002
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GROUP SUNSPOT NUMBERS ; SOLAR-CYCLE ; MINIMUM ; AMPLITUDE ; BEHAVIOR ; CLIMATE
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6132
专题太阳物理研究组
通讯作者Li, KJ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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Li KJ,Li, KJ . What does the Sun tell and hint now?[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(9):959-965.
APA Li KJ,&Li, KJ .(2009).What does the Sun tell and hint now?.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(9),959-965.
MLA Li KJ,et al."What does the Sun tell and hint now?".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.9(2009):959-965.
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