Latitude dependency of solar flare index–temperature relation occuring over middle and high latitudes of Atlantic–Eurasian region

By applying multitaper methods and Pearson test on the surface air temperature and flare index used as a proxy data for possible solar sources of climate-forcing, we investigated the signature of these variables on middle and high latitudes of the Atlantic–Eurasian region (Turkey, Finland, Romania, Ukraine, Cyprus, Israel, Lithuania, and European part of Russia). We considered the temperature and flare index data for the period ranging from January 1975 to the end of December 2005, which covers almost three solar cycles, 21st, 22nd, and 23rd.We found significant correlations between solar activity and surface air temperature over the 50–60° and 60–70° zones for cycle 22, and for cycle 23, over the 30–40°, 40–50°, and 50–60° zones.The most pronounced power peaks for surface air temperature found by multitaper method are around 1.2, 1.7, and 2.5 years which were reported earlier for some solar activity indicators. These results support the suggestion that there is signature of solar activity effect on surface air temperature of mid-latitudes.     

耀斑与磁环拓扑界面

北京天文台怀柔太阳观测站和美国大熊湖太阳天文台的矢量磁图系列，已经允许从观测上证认活动区内的磁环系统，及磁环之间的拓扑界面。本文作者基于１９９３年４月６日至１２日，对ＮＯＡＡ７４６９连续的矢量磁场观测，首次对一个活动区内的磁环系统和磁环之间的拓扑界面作了观测证认，这些拓扑界面的特征是：１）矢量磁场在界面附近高度剪切；２）在界面两边，有很强的纵场梯度（约０．１高斯／公里）；３）在观面两边磁对消，对消     

昂星团天区耀星成员性和相对数量的再讨论

本文通过统计比较，并用更完善的模型作成员概率的最大似然估计，对昂星团天区耀星的成员性进行了新的细致的讨论，指出Ｍｉｒｚｏｙａｎ等根据Ｊｏｎｅｓ的自行成员概率估计得出的非成员耀星呈现向团心集中强烈趋势的现象，是由于Ｊｏｎｅｓ对成员星成员概率的普遍低估以及对外围恒星成员概率的一定程度高估加上在中心附近观测误差和错误显著增加而造成的．本文根据Ｓｔａｕｆｆｅｒ等对更完整的样本估计的成员概率，以其中成员概率大于０．５的星为成员星，重新计算了昂星团内成员耀星在红矮星中占的比例（相对数量），表明了相对数量在ＭＶ＜８．０时随星等变暗而增大，而ＭＶ≈８．０时开始稳定在６４％左右，直至样本完整性的极限（ＭＶ≈１１．５）．因此，昂星团内无明显耀发活动的红矮星占该星团内红矮星总数的１／３左右或更少．