大磁暴后我国温度的变化

本文应用1955年英国格林威治观象台出版的大磁暴資料,研究了1909-1952年时期內历次大磁暴前后我国九站逐日溫度变化的情况。文中用重迭时序分析法,对大磁暴后90天内我国九站逐日溫度正距平百分率及平均溫度距平进行了計算,結果見图1。同样,对大磁暴前30天的計算結果,見图2。从而发現,在大磁暴后第10,16,24,44,75-77天附近,我国出現几次显著的溫度增暖期;而且在大磁暴前后,我国的溫度变动表現出27天太阳自轉周期性的振动。在大磁暴出現日期和其后第45天与第75天,亚欧地区自然天气周期的环流类型表現出清楚的韵律振动,因此认为天气过程的韵律振动当与太阳发射强烈粒子流輻射的活动区及其自轉周期发生密切关联。此外,本文还研究了某些小磁暴之后30天內,我国八站溫度的变动（图3）,发現在其后第13天附近出現显著的降溫。

THE TEMPERATURE VARIATION IN CHINA AFTER THE GREAT GEOMAGNETIC STORMS

In this paper the daily temperature variations of 9 Chinese stations during the 90 days after each great geo-magnetic storm in the period 1909-1952 （total number is 72） are analyzed by the so-called superposed epoch method of analysis. The daily temperature variation during the 30 days before each of the great geo-rnagnetic storms are also analyzed in the same manner. The geo-magnetic storm data are taken from the publication of Greenwich Observatory in 1955. The percentage of the days with positive temperature departure from the normal of the day in question and the mean daily temperature departures of 9 stations after the great geo-magnetic storms are illustrated in Fig. la and Fig. lb. Fig. 2a & Fig. 2b show the same parameters before the great geo-magnetic storms. From figure 1, we find that some significant warm periods occur at the 10, 16, 24, 44 & 75-77th days after the great storms. During the period of 120 days from 30 days before to 90 days after the great storms, temperature variations are found to compose a cyclic oscillation with a period of 27 days, which is just the synodical-period of the Sun. It is found, that the circulation patterns of natural synoptic periods during the great storms and 45th day or 75th day after the great storms show a high degree of rhythmic oscillations in the sense of Multanof School of long-range weather forcasting. Hence, we suggest that the rhythmic oscillations of weather process are probably intimately connected with the active regions of the Sun, which emit the strong corpuscular radiations and produce the great geo-magnetic storms. Besides, in this paper certain attention is also paid to some small geo-magnetic storms, which are used to correlate the daily temperature variations in China. A significant temperature drop at the 13th day after the small storms is revealed in Fig 3.