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Dependence of the F2-layer critical frequency median at midlatitudes on geomagnetic activity

机译：中纬度F2层临界频率中值对地磁活动的依赖性

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We put forward a method of separating the geomagnetic activity contribution to the F2-layer critical frequency median, foF2med, at middle latitudes. It is based on the analysis of dfoF2, which is the ratio foF2med/foF2q in percent, where foF2q is the F2-layer critical frequency for quiet conditions. The quantities foF2q and dfoF2 depend on solar and geomagnetic activity respectively. These dependences are taken into account using indices F12 (the average over 12 months flux of solar radiation at 10.7 cm) and Apm (the average over a month value of Ap-index), thus facilitating the use of this method for forecasting foF2med. With this method, from Slough station (51.5° N, 0.6° W) data for midday and midnight for 1954 to 1995 we have found that at midnight the dfoF2 dependence on Apm is significant at the 95 % confidence level for equinoxes and summer. For midday, this dependence is less pronounced and is significant only from April to July. At equinoxes and summer, an Apm increase causes a dfoF2 decrease. For midnight, this feature is more pronounced than for midday. This regularity is valid also for annual average Apm and dfoF2.
机译：我们提出了一种在中纬度地区分离地磁活动对F2层临界频率中值foF2med的贡献的方法。它基于对dfoF2的分析，该比率是foF2med / foF2q的百分比，其中foF2q是安静条件下F2层的临界频率。 foF2q和dfoF2的量分别取决于太阳活动和地磁活动。使用指数F12（在10.7厘米处12个月的太阳辐射通量的平均值）和Apm（Ap指数在一个月内的平均值）将这些依赖性考虑在内，从而有利于使用此方法来预测foF2med。使用这种方法，从1954年至1995年午夜和午夜的Slough站（51.5°N，0.6°W）数据中，我们发现在午夜和春分的95％置信水平下，dfoF2对Apm的依赖性显着。对于中午，这种依赖性不太明显，仅在四月至七月才有意义。在春分和夏季，Apm增加会导致dfoF2减少。对于午夜，此功能比中午更明显。此规则对于年平均Apm和dfoF2也有效。

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