电离层垂直探测电离图上的最低频率f_(min)作为电离层吸收的衡量标准与突发电离层骚扰(SID)的识别“指示”,已为人所共知。然而,从最近作者对武昌(30.5°N,114.4°E;磁倾纬度26.4°N;L约为1.20)上空电离图及其分析资料的考查表明:通过对f_(min)与各种类型的E_(s-l)的对比分析,发现可将f_(min)用于研究强吸收与高地磁活动的关系,从而为研究高地磁活动开辟了新的途径。 It is well known that the lowest frequency f_ (min) on the ionospheric vertical detection ionogram, as a measure of ionospheric absorption and an identification “indicator” of sudden ionospheric disturbance (SID). However, recent studies by the authors on the over-the-air ionograms and their analytical data of Wuchang (30.5 ° N, 114.4 ° E; magnetic latitude of 26.4 ° N; L of about 1.20) show that by comparing f min with various types of It is found that f_ (min) can be used to study the relationship between strong absorption and high geomagnetic activity, thus opening up new avenues for studying the geomagnetic activity.