What does the Sun tell and hint now?
文献类型：期刊论文
| 作者 | Li KeJun2 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2009 |
| 卷号 | 9期号:9页码:959 |
| 关键词 | GROUP SUNSPOT NUMBERS SOLAR-CYCLE MINIMUM AMPLITUDE BEHAVIOR CLIMATE Sun: activity Sun: general sunspots |
| ISSN号 | 1674-4527 |
| 英文摘要 | 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. |
| 资助项目 | [National Natural Science Foundation of China (NSFC)] ; [National Key Research Science Foundation] ; [Chinese Academy of Sciences] |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60397]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.中国科学院国家天文台 2.中国科学院云南天文台 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：国家天文台
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