Unusually high levels of solar activity distorting magnetic fields and even signals from Menwith Hill spy base, near Harrogate, an electronic monitoring station, have also been blamed.

太阳活动异常升高使地球磁场发生扭曲，甚至还使哈罗盖特附近的一处电子监控站、曼威斯山情报基地的信号失真，人们认为这也与赛鸽丢失有关。

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To unify the magnetic field level of the whole area in Marine geomagnetism surveying, the base value of the secondary base station must be reduced to the main base value.

海洋磁力测量多站日变改正中，为了使整个测区磁场水平统一，必须以主站为基准对分站日变基值进行归算。

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