NAOC Open IR
What does the Sun tell and hint now?
Li KeJun1
2009
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume9Issue:9Pages:959
AbstractSome 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.
KeywordGROUP SUNSPOT NUMBERS SOLAR-CYCLE MINIMUM AMPLITUDE BEHAVIOR CLIMATE Sun: activity Sun: general sunspots
Language英语
Funding Project[National Natural Science Foundation of China (NSFC)] ; [National Key Research Science Foundation] ; [Chinese Academy of Sciences]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/60399
Collection中国科学院国家天文台
Affiliation1.中国科学院云南天文台
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
Li KeJun. What does the Sun tell and hint now?[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(9):959.
APA Li KeJun.(2009).What does the Sun tell and hint now?.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(9),959.
MLA Li KeJun."What does the Sun tell and hint now?".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.9(2009):959.
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