【摘 要】
:
A method to predict the amplitude and date of the maximum sunspot number is introduced. The regression analysis of the relationship between the variation rate o
【机 构】
:
Beijing Astronomical Observatory
【基金项目】
:
国家自然科学基金;中国科学院资助项目
论文部分内容阅读
A method to predict the amplitude and date of the maximum sunspot number is introduced. The regression analysis of the relationship between the variation rate of monthly sunspot numbers in the initial stage of solar cycles and both of the maximum and the time-length of ascending period of the cycle showed that they are closely correlative. In general, the maximum will be larger and the ascending period will be shorter when the rate is larger. The rate of sunspot numbers in the initial 2 years of the 23rd cycle is thus analyzed based on these grounds and the maximum of the cycle is predicted. For the smoothed monthly sunspot numbers, the maximum will be about 139.2±18.8 and the time-length of ascending period will be about 3.31±0.42 years, that is to say, the maximum will appear around the spring of the year 2000. For the mean monthly ones, the maximum will be near 170.1±22.9 and the time-length of ascending period will be about 3.42±0.46 years, that is to say, the appearing date of the maximum will be later.
其他文献
There are two Cenozoic sedimentary basins in the East China Sea. They are the East China Sea shelf basin and the Okinawa Trough basin. The former can be divided
针对目前大学英语口语教学和大学生英语口语能力现状,本文探讨了培养和加强大学生英语口语能力的有效教学方法。
In view of the current status of college spoken English
本文以维果茨基“最近发展区”理论以及费厄斯坦的“中介作用”理论为基础,论述了外语教师在课堂上的中介作用的重要性及其在多媒体外语教学中的应用,提出教师应在多媒体外语
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
Based on the complex structure and material resources,the complex geological setting of the Mesozoic-Cenozoic continent of China controlled four kinds of dynami
The study of the relationships between the hydrothermal sedimentary formations and the gold and lead-zinc mineralizations in the Devonian Fengtai basin in Shaan
As a typical Palaeozoic island arc system, the eastern Tianshan area, Xinjiang, is different from eastern China but similar to the Meso-Cenozoic island arc meta
An REE-rich carbonatite dyke was found in Dulahala, close to the Bayan Obo superlarge REE-Nb-Fe mineral deposit in Inner Mongolia, northern China. The REE conte
A detailed tectonic analysis demonstrates that the present observed regional tectonic configuration of the ultrahigh-pressure metamorphic terrane in the Dabie m
日本文化从其历史来源和演变上看具有明显的多元性.这种多元文化是本土文化与异质文化相互融合后而形成的文化.日本人对待外来文化时采取的是选择性吸收--模仿复制--综合创新