东亚地区电离层Es出现率峰值的时空演变

通过对东亚地区20多个台的电离层垂测资料,进行逐年、逐月与逐台的比较研究,发现Es出现率峰(Es出现率最大处)具有时空演变.冬季的白天,峰位于低纬;夏季的白天,峰的位置随太阳活动的不同而变动;春秋两季的峰不明显,隐约可见其振荡在类似于海口与国分寺的纬度之间;夜晚,兰州、新乡与国分寺,几乎既是夜晚各季节的主峰所在,又是白天冬夏季节的亚峰地点.可见Es出现率峰,有着十分规则的变化,这一点与以往结论有别. 

TIME-SPACE EVOLUTION OF PEAK OCCURRENCE OF IONOSPHERIC Es IN EAST ASIA

The data observed from more than twenty stations in East Asia are compared month by month. year by year and station by station. It is found that the peak of Es occurence (place of maximal occurrence of Es)is noted for time-space evolution.Generally speaking : (1)Daytime peak is situated in low latitudes in the winter. (2)The places of daytime peak vary from low to high latitudes with the sunspot number from small to lager in the summer. (3)The peak is not clear in the equinox. (4)As for night the peak is always in about 36°N latitude. Thus it can be concluded that the peak of Es occurrence is changeable with certain regularities. This is different from the conclusions in the past.