极光强扰动对中低纬电离层的影响

本文考查了120°E附近的五个中低纬电离层观测站在极光强扰动下的f₀F₂行为。共考查了从1966—1970年五年资料中AE>1400日及1969年中AE>1000日的f₀F₂行为。研究得出了与印度站链有所不同特征——在极光强扰动下120°E中低纬五站之f₀F₂均有不同程度的减小,而不是增加,并且在中纬较高纬度的满州里站之f₀F₂减小比北京站要显著。扰日后效在中、低纬区不同,低纬之武昌、广州和海南岛三站均呈现扰动过后次日上午段的f₀F₂增加,中纬较高纬度的满洲里站仍呈现f₀F₂减少。我们认为这是由于低纬区主要受赤道喷泉效应改变的影响,而中纬及亚极光纬区主要受极光强扰时产生的环球电场的直接作用结果,它反映了纬向电场耦合传递的影响。当然极光扰动时对中性大气层的能量输入亦对观测到的现象有贡献。 

Effects of Enhanced Auroral Disturbance on Mid-and Low Latitude Ionosphere

The behaviour of f₀F₂ from five stations located at mid-and low latitudes around 120°E during enhanced auroral disturbances is examined in this paper.The data used are classified into two groups,one is for the years of 1966 to 1970 under the conditions of AE larger than 1400,the others is from 1969 for AE larger than 1000.The results show some features different from those obtained on the chain of Indian stations for AE>1000.Instead of an increase,f₀F₂ on 120°E stations decreased in general to some extent,f₀F₂ of Manzhouli,being at higher latitude,decreased more markedly than that of lower latitude station like Beijing.In addition,this study also showed different behaviours of the after-effect of auroral disturbances for stations of different latitudes.The f₀F₂ at low latitude stations such as Wuchang,Guangzhou and Hainan exhibits an increase in the morning immediatly after the disturbance,meanahile,Manzhouli’s f₀F₂ is still decreasing.It is considered that at low latitude zone the f₀F₂ is affected mainly by changes of the equatorial fountain effect.At mid-latitude zone,however,it is influenced mainly by a global disturbed electric field during enhanced auroral disturbances,this is a manifestation of the latitudinal transfering coupling of electric field.Of course,perturbations of mid-and low latitude neutral atmosphere due to direct energy input into the auroral neutral atmosphere also contribute to the phenomena observed.