Summary: | During the 1986-87 austral summer a geomagnetic observatory was installed at the Italian Antarctic Base Mario Zucchelli Station (TNB, geographic coordinates: 74.7S, 164.1E; corrected geomagnetic coord.: 80.0S, 307.7E; magnetic local time MLT=UT-8). In the first years, measurements of the geomagnetic field variations were carried out only during summer expeditions. Since 1991 the recording was implemented with an automatic acquisition system operating through the year. In this work we present the most relevant results obtained from TNB observations coming from more than twenty years of observations, also including a comparison with measurements taken at other Antarctic stations. Published Real Instituto y Observatorio de la Armada San Fernando, Cádiz, Spain 1A. Geomagnetismo e Paleomagnetismo open
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