Abstract. We examined the coast effect in Antarctica along the 80∘ S magnetic
parallel. We used the geomagnetic field measurements at the two coastal
stations of Mario Zucchelli Station and Scott Base, and, as a reference, at
the inland temporary station Talos Dome, during 18 January–14 March 2008.
Spectral analysis in the Pc5 frequency range (1–7 mHz) revealed
large differences between coastal and inland stations, such as higher
spectral power levels in the vertical component and higher coherence between
horizontal and vertical components at coastal stations. Using the
interstation method on selected active time intervals, with Talos Dome as a
remote reference station, we found that remote reference induction arrows are
directed almost perpendicularly with respect to their respective coastlines.
Moreover, the single-station analysis shows that at Talos Dome the amplitude
of the induction arrows is much smaller than at coastal stations. These
results clearly indicate that coast effect at a few hundred kilometers from
the coastline is relatively small. The coast effect on polarization
parameters was examined, for a Pc5 event that occurred on 11 March 2008. The
results evidenced that the azimuthal angle of polarized signals at one of the
coastal stations is largely different with respect to the inland station (by
∼ 110∘), while the polarization ratio and ellipticity attain
comparable values. We proposed a correction method of the polarization
parameters, which operates directly in the frequency domain, obtaining
comparable azimuthal angles at coastal and inland stations. Keywords. Ionosphere (wave propagation) – magnetospheric physics (polar cap phenomena; storms and substorms)
Remote effects in real induction arrows