Articles | Volume 35, issue 1
Ann. Geophys., 35, 139–146, 2017
Ann. Geophys., 35, 139–146, 2017

Regular paper 24 Jan 2017

Regular paper | 24 Jan 2017

A study of geomagnetic field variations along the 80° S geomagnetic parallel

Stefania Lepidi et al.

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We study geomagnetic field variations from 1 min data at three Antarctic sites (Mario Zucchelli Station, Scott Base, Talos Dome) along the 80° S geomagnetic parallel. The daily variation depends on local time, due to the polar extension of midlatitude ionospheric currents. The ~1–7 mHz power maximizes around 12 MLT, close to the cusp, and the coherence does so between stations around 24 MLT. The wave propagation is consistent with a daytime solar wind source and with nighttime substorm processes.