Some anomalies in geomagnetic variations observed in Italy from 1957 on, are referred about.
The main phenomenon, observed at Ponza Island (Central-Southern Italy), is characterized by an almost absolute parallelism between Δ
Z and Δ
H variations, during disturbances shorter than two hours.
In its larger evidence, this phenomenon is limited at Ponza Island and it attenuates rapidly when approaching the opposite Italian coast: it vanishes almost completely at L'Aquila Observatory (Central Italy) and Mt. Capellino (Genoa).
Instead, an effect of antiparallelism was observed at Frontone (North Italy) while operating a temporary station installed there in the occasion of the Solar Eclipse of February 1961.
A further investigation has been performed recently on
Sq variations.
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